Electricity Generator Brushless Alternator Testing - Generator with a capacitor.
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- เผยแพร่เมื่อ 31 ต.ค. 2011
- When your electricity Generator stops producing power, you need to know how to test the Alternator to find what has failed. This video will show you how to do this. Send us your results and we can tell you which part you need. Email us via our website generatorguru.com/ask-the-guru/
**If your generator has a Brushed Alternator please see our testing video "How to test your Electricity Generator's AVR, Brushes and Alternator on a Brushed Alternator."
If you have any questions please email us through your local Generator Guru website. We are always happy to help.
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Saved the day, tested 5 to 6 volts AC from coil and 20 uF capacitor testing only 15 uF. Replaced suspect capacitor for new 20 uF and output voltage returned just like magic. Thank you Generator Guru.
Always happy to help! You made our day by letting us know. Thank you.
You guys have been a big help with me and my generator issues. I ordered some parts and installed them into my generator and am now just waiting on the rest of the 2nd round of parts I ordered so I can complete the repair and put the rest of my generator back together.
Thanks for the reply,the 10uf cap measures 4.7uf so ill try replacing that as you say first.
THANK YOU SO MUCH! You've been really helpful, and I appreciate it! I have a DeVILBISS PowerBack GT5000 and I didn't knew that has a capacitor inside the alternator cover. I did exactly what you said and... BINGO! 4 to 5 volts! I check with SEARS and they have it. Part# GS-0592. Hope this will help others! ...GOD Bless!
We are always happy to help! :)
Thank you!!! Just the advice I needed!!
Thank you Styles! Very helpful video - new capacitor ordered from your site (exact part match from manual).
Helpful information, thank you. I replaced a defective 16 uF cap. with a 20 uF. I had someone tell me the higher rating will effect the output voltage, and the frequency will be incorrect if I adjust my engine speed to compensate. That doesn't makes sense to me though, as the cap has nothing to do with the output itself. Correct?
hey guru
thank for the video. I am getting only 2 volts when throttled up and wondering if a bad diode could cause this issue. Capacitor is leaking and bad it is rated 22uf. Will replace but not sure if it will make a difference
Any thoughts or ideas about the 2 volts would be great
Thank you very much thank you very much I learnt a lot I will still keep a close eye on your channel keep it up good work
Thank you for the lesson for the capacitor I Needed to know how it works thank you for explaining it Helped a lot.
HI Cornelius
Always happy to help! :)
Thanks for the feedback :)
The capacitor excites the windings, so it will affect the output. There is a 5% +/- so you can vary it between 15uf and 17uf.
Hope this helps :)
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Español
Nice job! THANK YOU.
Hi, Thanks for your helpfull video, I have followed your instructions on my 4kw Italian alternator and got a reading of 4.2v at the capacitor terminals.I also have 5 volts at the plug not 220v. I have a few capoacitors around so I tried them and the condition didnt change. I noticed that their is only 1 diode on the rotor and the oposit side appeared as tho the diode might be missing? is that posible? should I buy the right capacitor or look into the diode?
I have an old Powermate model#PM52-2000, That was given to me. Motor runs great but no power. Its brushless from what i can tell so ill try this. I hope its the capacitor and not the stator/rotor since those are discontinued.
Is it the voltage changeover switch you need a wiring diagram for? If so how many connections?
Yes it was a very windy day. I plan on re-recording asap. In the meantime if you have any questions please post them here.
Thanks for all the excellent info.
I have a Dewalt DG6000 brushless generator that produces no power through the protected 120V outlets and 2.3V at the 120V and 240V unprotected twist lock outlets. The capacitors are 20uf and both test at 22uf. The leads from the alternator to the caps. Produces 4.3V. The circuit breakers test good and I have no power. I'm confused. I don’t want to start throwing parts at it until I know what to buy.
Thanks
I would like to thank you for the show up , you are such a good teacher. Please keep it up am following you always and i still need your help
Thank you! 😃
Thanks for the tips, I have got a used and the fellow I got in from took it apart to wire it for 240/120 & mess up the wiring order. So now I have to figure it out. So here I am on youtube looking for answers.
It sounds like the capacitor is blown. Just to double check do a continuity test through those wire both ways. It should only work 1 way if set on lowest voltage.
Hope this helps.
Thanks for sharing👍
I’ve watched several videos about trouble shoot but most were avr which confused me, this is simple, relevant and took me straight to proving that my capacitor ‘which had burst open at the terminal end’ was fried, I crossed the terminal to make sure discharges then pulled it open and can see the melted insides and disconnected wire, it’s a Ducati 16uf on a Honda GX160 dont know who made alternator as plate missing, checked volts on the two wires with engine running as instructed and 6.7v so within tolerance I believe, is it better or worse to be 2v higher than lower or does it really not matter as long as it’s between 3&7v many thanks for your simple short video
Thanks for getting in touch. Replacing the capacitor should fix the issue.
If the VAC output is a bit high it will might affect the longevity of the new capacitor. But.. if there are no surges on any equipment you attach, it should last for 100's (if not 1000's) of hours. ( We would also suggest you get an electrician to test what you last had plugged into the generator. Often it is faulty equipment that can cause this issue and make the capacitor overheat and blow.)
We hold a whole range of generator capacitors on our website. www.generatorguru.com/capacitors/. :)
You can only connect it one way and it work. If it isn't producing power shut down the machine and change them around. It will not harm the capacitor if you have put them on the wrong way at first.
Hope this helps :)
Thanks a bunch
Good video. I just picked up a 5250 watt brushless generator. Hope I don’t need to fix it but you never know.
Hello, I would like to know if there is continuity between the capacitor and the incised winding?
Greetings.
this is good video ... I was wondering ... If I don't know where I connect the capacitor ... I mean which terminals .... should I measure the resistance of the exciter and the main winding ... and how much should be the resistance of the exciter and main winding ... I mean the resistance of the exciter winding should be more than the main winding or less ... please let me know if would like to help me .... best regards
Hello, I have a Coleman Powermate, model #PM0542000.01. Prior to performing this test I measured ~2 Volts at my receptacle. I performed this test and measured 4.3V AC. Based on your video, my alternator functions properly. I replaced my 12.0 microfarad, 350V capacitor with a 12.5 microfarad, 370V. I am still measuring ~2 Volts at my receptacle. Please help!
It can be one of 3 things:
1. The capacitor has been wired backwards. With the engine off, switch the capacitor terminals the other way around and restart the generator. (If it is wired backwards it will not damage the capacitor if run for a short time.)
2. The engine is running a bit slow and not exciting the capacitor. To speed up slowly turn the screw on the top of the carb, this will adjust the amount of fuel, and the speed of the engine. Use your voltmeter to get to the right voltage. If this does not work switch the capacitor terminals again like in step 1.
3. The diodes in your alternator have blown, best to find a local motor rewind shop and see if they can replace them for you.
i have a 6Kva diesel welding/generator.. having trouble to test its diodes... please help me thank you
Excellent video Guru, I have a Generac XG8000E. I pulled the cap out and used my MM to measure the gen voltage and I am getting 1.5 volt, does this sound like a faulty cap? Thanks!
As your results are showing a low voltage so we suggest you “Flash” your alternator. Follow the steps below:
1. To re-excite your alternator, we suggest you only use this method, as described by Generac Generators on TH-cam: th-cam.com/video/-LR62sm7USU/w-d-xo.html
2. Run the generator for 20 minutes without load to stabilize the magnetic field in the Alternator.
3. Test with suitable appliance to make sure the load is stable. If not go to step 4.
4. Repeat our tests: www.generatorguru.com/help-me-fix-my-generator-repair-advice/
If results are below 1 Vac, repeat step 1. If this continues please contact us.
If results are between 1-7 Vac, but you are not getting full voltage at the sockets, then you will need to replace your AVR/Capacitor.
If results are above 8-10 Vac range, then you will need to replace your AVR/Capacitor. But be warned that the high reading will damage the AVR/Capacitor over time. This could result in it lasting a fraction of the time expected on a stable alternator.
If results are above 10 Vac range, be sure you removed the AVR/Capacitor before testing. If you have and are receiving this result, we suggest you take your generator to a “Motor Rewind” company for repair. You can find your local Motor Rewinding company by doing a search on the internet for “Motor Rewind.” It is worth asking for a quote from a few Motor Rewind companies as their prices can vary greatly.
best video I have found
Test the winding for continuity. Should only show 1 way. If not replace your diodes.
Hope this helps!
the best work
hi generator guru thanks for handy tips .... tell me what cause the diodes to go bad on the rotar
Hi! This is usually due to overloading the generator, or if you have a faulty piece of equipment attached that is faulty and arcing and therefore asking too much of the alternator. If it keeps happening with the same equipment on (and you use lots of different stuff on the generator) then def get that equipment tested.
As to overloading, be sure that you try to only load the generator 2/3 of max watts unless it is a GENUINE "Honda Generator" (i.e. not just the engine but the whole generator) then they rate theirs at 2/3 power for you.
This allows for surges when things like motors start. Whenever you start anything there is a surge, and if it has a motor like fridges, freezers, drills) it normally takes about double the running watts to start it. Other stuff takes less and they do not need to move anything, just excite their components.
Please also be aware there are many generators being sold on selling sites and "side of road" sales that are mislabelled and a scam. They will do this by putting a model number like 8500w to make it look like they give out that amount, when in fact they only give our about 2.8kw. If you are suspicious as to what your generator gives out and it keeps blowing AVRs or Capacitors, please contact us on our website www.generatorguru.com and we will be happy to identify it for you. (Hint - these are mainly common in EU. Framed versions that have a 3 phase sockets and 3 x 240v plug sockets and often have "kraft" in their name. There are also Inverter versions that are sold as 2000w but have a capacitor under the side flap (i.e. not an inverter and built to only give out 750w). Please contact us for full info on these units. They can still be used at lower power, but there are safety things you need to know if they have a 3 phase socket!)
great video thanks
Buenos videos saludos de mexico oaxaca
We thank you for your interest in our help videos. Unfortunately, due to limitations in TH-cams comment sections, we are unable to quickly answer questions in the comments. Please feel free to contact us directly here: www.generatorguru.com/need-help/
I got the same genny as you have in the video and witout the cap installed I get around 24 - 30VAC across the two wires. It also doesn't charge the brand new cap I bought (18uf / 425V). Any ideas?
It has probly blown the capacitor. 24- 30 Vac is indicating that the alternator is arcing. You need to take it to a Motor Rewind shop for them to fix it for you. They will re-wire the winding for you. It is worth a call around though as prices vary greatly from one company to the next.
We have a listed an number of these shops around the world on our website generatorguru.com/dealers-repair-centres/
Hope this helps :)
@@Generatorguru - I have a leg on the 240 30amp that is dead. What could be the issue?
Hi my name is john i am a small engine tech i have a yamaha gen mod yg6600d i have a problum i was looking at your video i have a wireing dig on the gen it is brushless the ave has 2 wires comming frome the alt assy black/ white plug the gen runes like it is under a load with nothing on it when i dic the plug the load goes away the avr has a cap that goes 2it and a nother 3pin plug that goes frome the ave to the gen i think the avr is shorted it has a new cap can u give me some help thank u
Thanks for sharing
Thanks for watching!
45uf sounds about right. What do you mean by "wind engine out?"
Run engine
Thanks. Question. You mention 5 Volts. is this universal? I have a Dewalt DG6000 with a 40 microfarad running capacitor.
Also, I am unfamiliar with the difference of a generator capacitor and general capacitor. I have purchased Edilson 40mdf running capacitors. They last about 3 weeks and fail.
+Indio Jones Yes the 5 Volts AC is universal on all portable generators. None of us engineers here have heard of the Edilson Generator Capacitors so we are unable to comment on the quality or reliability. If your alternator has a Wiring Bridge for the windings you could run the tests in this video (minus the brushes) as this will test each leg individually.
th-cam.com/video/tC_LrrZcx38/w-d-xo.html
If you need further assistance, we think it is best if you can submit a support ticket to contact our engineers direct, so we can send you more in-depth details on the next step, and dedicate an engineer to your query. www.generatorguru.com/ask-the-guru/
Thank you. We shall get our test results today. We be purchasing a Yamaha OEM generator 40 mdf capacitor. Honestly, until the video, I didn't know that there was a capacitor specifically for a portable generator. Now that I know, I will be more specific. And to update you on the brand.
Edisson
The name of another company of which we bought a higher , 60mdf capacitor (yes, we super-sized it this one time to check to see if low microfarads was an issue), was Everwell parts. Both brands are failing
This afternoon we shall conduct the first test and if I have internet will view this video and perform the second test.
+Indio Jones If you need further assistance, we think it is best if you can submit a
support ticket to contact our engineers direct, so we can send you more
in-depth details on the next step, and dedicate an engineer to your
query. www.generatorguru.com/ask-the-guru/
I have a 3000 watt generator check voltages at L1 to L2 and R1 to R2 have 5 votes from L1 to R1 0 votes
Brushes have 8 to 10 votes
I did change out the AVR did not help
But the output for 120 vac I’m getting 29 votes for 240 vac the reading is 58 votes
What would be the my next step thanks
We did the replaced the capacitor we are running 5 volts at the alternator but still not getting any power
I operate a small portable concrete rig powered by a brushless generator. It consists of a 1hp motor (mixer) and a 1/2hp utility water pump . A pressure switch had been added to the water pump to prevent overheating/failure as water usage is intermittent . This worked fine for some years until the capacitor failed. Replaced and back to work . This new one also failed in 2 months time. I have 2 questions. First is could a water fitting leak cause the capacitor failure as it activates the water pump upon pressure loss ? This would increase the frequency of triggering the pump on/off for a few seconds as pressure recoupes. (Fitting to be corrected prior to capacitor replacement) . The second question is would adding an additional equivalent capacitor in parallel harm the generator ? The first failure was induced while using a 15amp breaker hammer with said water fitting leak (fyi). Thanks for any feedback.
Ok a lot to unpack there.
We need to assign you to an engineer to run through the answers for you. But they need to know a bit more info:
1) What generator do you have? (if not sure what is the output on the label) If too small to account for the high surge getting the equipment running and keeping it going, will continuously blow the capacitor.
2) What are the amp readings on each piece of equipment you use on the generator, and what do you always use together? The amp ratings will be on a sticker somewhere on the equipment.
2) If water is leaking on the alternator, this can cause arcing and will blow capacitors and maybe more. Keep the alternator dry!!!!
Once you got all this, copy and paste this thread and contact our engineers on generatorguru.com/need-help/ > Engineering Support > I Dont Know.
We will assign you to an engineers who will be happy to work with you. FYI, we do not charge for advice. :)
Harikasınız
You are a legend!
sparkyuiop ihaveeightkcuemodelnoac
8000 KW brushless generators c u e motor
No AC current could it be the capacitor or the AVR would someone give me an answer to this
8000 KW brushless generators c u e motor
No AC current could it be the capacitor or the AVR would someone give me an answer to this
Cup
Fantastic video!! With the new capacitor it has a different connection so how does it connect to the cables, can it work both ways?? If not then what test do I do?? Many thanks 😊
Thanks! That made my day!
A capacitor is like a one way valve, so no. It can only be fitted one way. If you have to disconnect or switch the wires over, then be sure you discharge the capacitor or have safety gloves. It could give you a nasty burn otherwise.
If you bought the capacitor from us please get in touch vis the website. We can direct you with more accuracy if we know which capacitor you have. :)
generatorguru.com
@@Generatorguru thanks so much for your reply, do you have stock in the UK?? Also does it matter if the Microfarad rating was double my old one? Everything else is the same other than the UF!! Many thanks 🙂
I have an older 5500 watt brushless honda generator pro series. Anyway this thing has no output. Checked the power going to the capacitor and I get just shy of 10 volts. It's not right I know because of your video. Is there anyway to compensate for that? I checked the voltage going to the capacitor and had 9.8 volts at governed speed. Slowed the running speed and got the voltage down to 7.6 volts. Can the voltage be compensated for?
Unfortunately no. If you change the speed of the engine, you change the hz output. :(
I have a Makita g1200r Geny I rebuilt the carby and it worked fine, after shutting down to put covers etc back on I started the Geny and now doesn't out power.any idea's.ive tried the drill trick to no avail.
Hi there
For fault finding or technical advice, feel free to contact us using the link below
www.generatorguru.com/need-help/
This will allow our engineers to review your query and give you the best possible advice!
still good advice ty
Thanks :)
Hi, thanks for the video.
My name is Jose Monica from Portugal, and I have a very old Honda EX650 generator 220Volt. The condenser is damaged, and I can't find the capacitance of it. Can you help me?
+Jose Monica If you contact us, our Engineers they can help you pinpoint the part
you need. www.generatorguru.com/ask-the-guru/
What if some have an in between sized capacitor?? My Campbell Hausfeld that produces 2,500 watts peak, 2,100 watts continuous and is powered by a flat head vertical shaft Briggs & Stratton 5 HP engine. It has a Facon brand 12.5uF (+-5%) 450 volt capacitor. The model number of the capacitor is 7G73125L62. The generator was bought new back in 1995. It current has 223 hours on it. It's used to keep the Amana upright fridge (7.2 amps running) going during a power outage.
Hi there
Rounding to the nearest whole number is ok, please see the link below
www.generatorguru.com/generator-capacitor-dry-cell-series-450v-12uf-5/
Thank you
You're welcome
Tengo una falla en un generador de 8000watts, tengo que bajar la regulación del AVR , para arrancar , y después que arranca tengo que regularlo nuevamente al voltaje que trabaja, en esté caso es a 120voltios... Cuál será la falla ?
Hi there. Thanks for this video. I have a Sdmo sh2500 that has stopped putting out electric. I have just done this test and it’s putting out a steady 9v. Is this to hi. Do I just get a new capacitor and try it. Many thanks
The results are very high. You can replace the capacitor but it will sooner or later blow the next capacitor... and/or worse... put out high voltage, blow the equipment attached too, possibly electrocute someone or cause a fire! So it is not a safe option.
@@Generatorguru many thanks for the reply, what would make it run high like this please.
Hi there, I tested my old etq 5000 generator and it reads 2.5v from those same leads you’re testing. I replaced the cap with a new one same ratings. When I test past those connectors to where the cap would be I get 1.5v any suggestions???
Dear Sir/Madam,
As your results are showing a low voltage, we suggest you “Flash” your alternator. Follow the steps below:
1. To re-excite your alternator, we suggest you only use this method, as described by Generac Generators on TH-cam: th-cam.com/video/-LR62sm7USU/w-d-xo.html
2. Run the generator for 20 minutes without load to stabilize the magnetic field in the Alternator.
3. Test with a suitable appliance to make sure the load is stable. If not go to step 4.
4. Repeat our tests: www.generatorguru.com/help-me-fix-my-generator-repair-advice/
If results are below 1 Vac, repeat step 1. If this continues please contact us.
If results are between 1-7 Vac, but you are not getting full voltage at the sockets, then you will need to replace your AVR/Capacitor.
If results are above 8-10 Vac range, then you will need to replace your AVR/Capacitor. But be warned that the high reading will damage the AVR/Capacitor over time. This could result in it lasting a fraction of the time expected on a stable alternator.
If results are above 10 Vac range, be sure you removed the AVR/Capacitor before testing. If you have and are receiving this result, we suggest you take your generator to a “Motor Rewind” company for repair. You can find your local Motor Rewinding company by doing a search on the internet for “Motor Rewind.” It is worth asking for a quote from a few Motor Rewind companies as their prices can vary greatly.
Hi can you show a test of the winding. I did the test...having around 5 v...replaced the capacitor also..still having output of 100 v instead of around 240v....thanks to help.
Please set up a support ticket with our engineers and they will be happy to assist you. generatorguru.zendesk.com/hc/en-us
P.s. We do NOT charge for this service
hi I have a scorpion 3000 , 240v not putting out any power only about 5v ac it has been sitting for a while and may have lost its magnetism?
it has a 12 v DC outlet also and was wondering what is the best way to flash the fields?
thanks
Steve.
+Steve Sanders If you contact us, our Engineers they can help you pinpoint the part you need. Get the test results as per this video before you contact us please. www.generatorguru.com/ask-the-guru/
I heard you say so not use oil on the alternator. The bearings went out in my unit and i replaced them and also brushed the rust off the stator and rotor surfaces and applieda light coat of motor oil with a dab on a rag. Now it won't make power. Going to get some cleaner and see if i caused the fail with the motor oil.. fingers crossed
I cleaned the oil off and still not making power. The 2 wires i disconnected from the capacitor are getting 4.99 vac with engine running
Ah! Yes oil gets sprayed into the Alternator when you do that. You should always replace the bearing with enclosed bearings that do not need oiling.
Common mistake, so don't feel bad. But quite bad news really if you used enough oil that it has sprayed itself over the alternator. Oil will keep spreading to 1 micron thick, and will cover everything and cause arcing when the alternator is run if it has made it way to any wiring.
If the oil has spread - You need to take the Stator (windings) off to take to a Motor Rewind Company to clean for you. The reason for this is because they will use special solvent and will oven dry it before you use it again (both needed to prevent further arcing.) Replace bearing with correct type as well.
If the oil has not spread - then it is probably a failure from the original bearing failing. 4.99v looks good but we need to get you to do more tests to see if there was any damage done. Please contact our engineers on generatorguru.com/need-help/ > Engineering Support > I Dont Know, with as much info as possible and we will be more than happy to help with the next tests.
Say GG, new sub here. I have an 1997 (guessing) Northstar PPG 8000 that I got with a blown cap. I replaced both as long as I was at it (Appli Parts Run Cap 12.5 uF, 370vac, 50-60Hz) and still no output. Do I need to flash the field and how do I do that? It's brushless. Great vid, thanks! PS/ In it was a Facon 12.5 uF and a Ducati 16 uF. The latter blew. Greetings from New Jersey btw.
Hi there
Before flashing the field, disconnect the capacitors, run the generator and check the voltage inputs into the capacitors
My promax 6000a 9hp vanguard generator is running but not producing power. What could be the problem ? It has taken long without using it , yet it was working since the last use.
Assuming your reading when running this test on the video were good. If it was sitting for over 6 months and produced power, then try flashing the alternator. (DonyBoy has a great video for this: th-cam.com/video/lsN9S1luQzA/w-d-xo.html.) If flashing it does not fix the issue, you will need to replace the Capacitor. :)
Replacing the capacitor worked for me. Thank you. But still voltage is bit wavey(200-230v) . Any fix for that?
Hi there, does the generators revs vary? they should be constant and so should be the voltage
Styles Generator Guru yes engine revs very. Later i realized when i add around ½ of the full load . Voltage and engine get more stable. How can i fix it?
Hi there, is the generator a gasoline or diesel unit? This sounds like a slack governor, if you can tell us what generator you have, I can provide more detailed instructions
It's gasoline. It's AM950. I Think it is a Chinese clone of yamaha 950 , 800w generator or Harbour freight 800w generator.
Hi there, this means that one of the governor springs has slackened, I suspect the larger of the two, if you remove the fuel tank, the governor assembly will be right on top of the engine, one spring holding the arm in place and attached to the engine body and one over the governor rod that attaches directly to the carb, you need to ensure that both of these are taught
the capacitor I got to replace the blown one has two wires coming out instead of the hard metal terminals, will that work?
So long as it is a Generator Capacitor and the volts and microfarad match (number followed by uf) then it should work perfectly. Attach the wires and start the engine, if it does not produce power stop the engine and change the terminals around.
Hope this helps. If not feel free to contact us back. :)
Generator Guru
yes, numbers match up only difference is what i mentioned...thanks
Yes it will. You just need to cut the original wires from the capcitor as close to the capcitor housing as possible and put spade terminals on them to make the capacitor fit.
Generator Guru
ok, thanks, i'll do that..
Doing your test, I get 12 volts at the (removed) cap leads.
with a 16uf cap I get 105 volts.
with a 28uf cap I get 133 volts
should I just try a 22uf?
What would cause it to put out 12 volts instead of 5 volts?
Thanks
Not quite. It will depend on the way the alternator was wound and the copper gauge of the wiring. I think it is best for you to set up a support ticket with our engineers. This way we can advise you particular to your generator. www.generatorguru.com/need-help/
Im getting a reading of 13.1 volts on the test, is this ok? its the exact same model generator as in the video.
please contact us via support@generatorguru.com the information is too extensive for the youtube comment section
Hello, I congratulate you on your channel.
I consult you, I have a Mrca Kubota AE2200 generator, it did not generate 220 volts voltage, it uses a 13 Uf capacitor, I made sure that the generator speed is 3600 RPM, and I changed the capacitor for another similar one (14 Uf) but it did not generate, and I did several tests with different capacitors, until when placing a 40 Uf capacitor, I got to generate 210 volts. I ask you what will be going through what needs more capacity. Saludos desde Lima Peru. Gracias.
Ok, lots of info. 1) ideally you need a 14uf capacitor or one within a 5% tolerance to get a stable electricity feed. You can get one here: www.generatorguru.com/capacitors/ 2) You need to flash your alternator as the magnetism has dropped out (generac do a great video with a corded drill.) 3) If this does not work, switch the wires on the capacitor around and follow step 2 again. If you still have issues please contact us via our website, and we will ask an engineer to assist you. www.generatorguru.com/need-help/
Hi i have a 6kva generator with no power.. im geting 1.6v at capacitor connection wires with capacitor disconnected and its 2v with capacitor connected what you think? Thank you
Dear Sir/Madam,
As your results are showing a low voltage, we suggest you “Flash” your alternator. Follow the steps below:
1. To re-excite your alternator, we suggest you only use this method, as described by Generac Generators on TH-cam: th-cam.com/video/-LR62sm7USU/w-d-xo.html
2. Run the generator for 20 minutes without load to stabilize the magnetic field in the Alternator.
3. Test with a suitable appliance to make sure the load is stable. If not go to step 4.
4. Repeat our tests: www.generatorguru.com/help-me-fix-my-generator-repair-advice/
If results are below 2 Vac, repeat step 1. If this continues please contact us.
If the results are between 2-7 Vac, but you are not getting full voltage at the sockets, then you will need to replace your AVR/Capacitor.
If results are above 8-10 Vac range, then you will need to replace your AVR/Capacitor. But be warned that the high reading will damage the AVR/Capacitor over time. This could result in it lasting a fraction of the time expected on a stable alternator.
If results are above 10 Vac range, be sure you removed the AVR/Capacitor before testing. If you have and are receiving this result, we suggest you take your generator to a “Motor Rewind” company for repair. You can find your local Motor Rewinding company by doing a search on the internet for “Motor Rewind.” It is worth asking for a quote from a few Motor Rewind companies as their prices can vary greatly.
have a echo 5500 brushless generator,,, 2 ,,28uf capacitors wired parallel,, 2.53vac out of alternator,,, and can see wires got hot between alternator and first cap ,,,,low voltage and have cycle fuse to get start showing voltage bout 60vac
Tammy, we would love to help you with this. The reading seems to indicate replacing the capacitor should fix the problem. We sell replacement capacitors on our website on this page: www.generatorguru.com/capacitors/.
I would also replace the burnt wiring, and inspect the windings to be sure there is not burn marks on the windings or burnt smells coming from the alternator (apart from that wire of course.) If there is, it indicates the windings overheated and the varnish on the windings might need revarnishing. This can be done by you local Motor Rewind Specialist.
Hope this helps! If you need any further assistance please let us know.
Hola gracias por la información tengo un generador de dos polos sin escobilla 7.5 en 3600 rpm la tensión es 12 vol con condensador 30 microfaradios quisiera saber cual es el adecuado por fa
Dependerá de la forma en que se enrolló el alternador y el calibre de cobre del cableado. Creo que es mejor que configure un ticket de soporte con nuestros ingenieros. De esta forma podemos asesorarte en particular para tu generador. www.generatorguru.com/need-help/
si no hay ningún voltaje en las puntas de donde se conecta el capacitor que prueba debo hacer para identificar el problema de que no genera voltaje?
El generador que usamos es un Coleman Powermate Pro11000 que usa dos capasitores en paralelo y los dos son de diferente capacitancia y de diferente voltaje y solo uno de ellos es el que esta malo y es el de mas baja capacitancia.
Gracias por sus consejos.
el capasitor malo es de 40 MF y 370 VCA saludos
I have a Generator giving me a output of 230VAC at 41Hz
After doing this test with the CAP disconnected I get a reading of 11.7Volts.
Any advice on the cause of this or potential to rectify ?
I believe this is causing a low frequency issue with generator
You need some further advice from our Engineers. Please contact them on this link and they will be happy to advise you for your generator: www.generatorguru.com/need-help/
Amigo consulta, este tipo de generador no tiene AVR? Tengo uno muy similar y me entrega 5v a 6v en la conexión de 220v.
Será que está malo el capacitor?
Please set up a ticket with our Engineers to discuss further as there could be a few reasons. (We do not charge for this service.)
www.generatorguru.com/need-help/
Hi Sir, capacitor of how much capacitance do i need for 2800 watt generator???
+Mian Qaiser Unfortunately it is not as simple as just knowing the wattage to tell you the capacitance microfarad. It depends on the length, diameter and winding technique used in your alternator. Submit a support ticket with our engineers and we will try to get that information from your Make and Model details. (If your not sure of the Make and Model, can you send us a picture of your generator and the capacitor to us, we might be able to recognise the brand if you are not sure.) www.generatorguru.com/ask-the-guru/
You need to watch my other video about Brushed AVR Generators. But it sounds like the diodes in the rotor have blown and need replacing.
@Generator Guru
Hi , I have a generator but mine is Honda em25 (2.3kw, 220v) cycloconverter generator but I got it without electronics (module and front panel), just engine with flywheel (drum) and coils inside . Is there any ways to bypass all of that and make it run ? Just to make engine running , I don't need current . Or any modifications regarding , Thanks
Must admit, not an expert on that generator. But the engine looks like a normal setup.
1st you might want to remove the alternator to see if the crankshaft connection is any good for your new project. Generators 90%+ of the time use a tapered shaft which is only really found on generators and due to the shape make it very difficult to use for other purposes.
If you need another crankshaft type you will need to replace the crankshaft (or see last suggestion.)
If your happy with the crankshaft connection and it is manual start you could take the alternator and most wiring off and it will run happily. Be sure not to remove any wires from behind the flywheel as this will be to your ignition coil or that go into the engine, or attach to what goes into the engine.
If electric start you will need to fit a key start unit (search the engine model, Honda and key start on search engine) and keep all wiring for the starter motor, battery charging rectifier (finned on back) and battery.
ALTERNATIVELY - sell it on ebay as "spares and repairs" and you might make enough to buy a new engine with the correct crankshaft for your project. We sometimes get asked for engines for these and they seem like gold dust these days.
Hope this helps!
The Generator Guru Team
@@Generatorguru Thank you so much for the advice . Thank you
Thanks for the feedback! Really helps us. :)
I have brushless generator and changed the capacitor but still reads only 1 volt at idle. the volts going to the capacitor read 5v so thats good. if i rev up the engine really high the volts increase to passed 120v. when i plug in a device the engine rpm doesnt increase and im only getting 1 volt at the socket. only way to increase volts is manually with carburetor so thats no good. can someone please help me? I checked the breaker and it is good.
It sounds like a dodgy capacitor or you have wirted it up backwards. Try switching the wires to see if this is the case. If you need a capacitor we sell them on our site www.generatorguru.com/capacitors/. If you still have issues please contact us via our website, and we will ask an engineer to assist you. www.generatorguru.com/need-help/
Humm mine got 10.6 volts ac the first test and 7.6 volts ac the second test. I wonder if my alternator is any good?
Hi there
For fault finding or technical advice, feel free to contact us using the link below
www.generatorguru.com/need-help/
This will allow our engineers to review your query and give you the best possible advice!
Getting no power from my SIP medusa, the 10uF capacitor is testing as a complete dud. and the voltage from the alternator is 8.9VAC, you video says 5VAC ± 2. Am I too far out the desired range?? TIA
Dear Sir
it is slightly too far out of range, you will blow any replacement capacitors you fit unfortunately, however you can take it to a motor rewind company to find out how much it would cost to be repaired
Hi i tested the voltage going to the capacitor and it was 18v! Any idea what's wrong thanks.
Philip, sorry for the late reply. We are having technical difficulties answering questions. We need to speak to you about the next steps. Please call us. Our number is on our website for your local Guru. GeneratorGuru.com
Hi I was getting between 17 and 19 volts also what's the next step . Friday it was working then we come to use it today and nothing it was running right up to we shut it off on Friday. Thx for your help
what if ever with new capacitor, we have voltage oscilation from 180 to 230v?? thanks
Please contact our engineers via our help centre for 1-on-1 help. www.generatorguru.com/need-help/
I've got a Northstar 13000 brushless generator set that's putting out only 111 volts at 61.5 Hz. Since there's no AVR on a brushless, what might be done to increase the voltage output to 120V per leg so that my refrigeration compressors don't struggle? If this capacitor is out of tolerance, how does it affect the voltage? Larger capacitance makes lower or higher voltage?
Sorry for the delay in answering, we were not aware of the question until today (no email from youtube.) We can give you more assistance if we can assign an Engineer to your question. Please, can you contact us with this question via our website, so we can send you full instructions? www.generatorguru.com
That was actually pretty fast! Will do. Thanks. I've been advised on the Smokestack forum that increasing the size of the capacitor would increase the voltage. Could be mine got one of the caps that fell into the minus side of tolerance.
DO NOT DO THIS! Your capacitor has been matched to suit the winding design and length. Increasing the capacitor will increase the voltage BUT it will also heat up the windings further than they are designed for. This will result in the varnish on the windings melting and resulting in the alternator arcing! You will damage the windings and they will either need replacing or rewinding (both are expensive!) Did you contact our engineers with the results from the test? Do not worry if a brushless unit we can still assit you. :) www.generatorguru.com/ask-the-guru/
That is an interesting point, but it IS a Chinese made genset and the voltage is too low for our enterprise UPS to consider it proper and keeps popping in and out of AVR Boost mode. Normal line is 122VAC and the genset puts out 111VAC at no load.
The capacitors, based on the exploded view of the unit, are located in a metal box on top of the alternator. However, two of the screws that secure it are blocked by the electrical outlet panel on one side of the genset, so I have not been able to get in there. This is a new genset from Northern Tool, BTW. They won't do anything about it because it's within their loose 10% voltage tolerance. Anything between 108 and 132 volts is considered normal to them. But my a/c compressors and UPS don't like the low voltage.
Have you done the 50 hour service? If not please do this now to be sure the engine is running at the correctly If you are still having trouble please email us directly for the next test you require. (Too much info to post here) www.generatorguru.com/ask-the-guru/ We are always happy to help! :)
Is there any way to tell which wire is positive on a brushless gen when installing new capacitor.
No sorry. If it does not work one way you will need to change the wires.
See this video on capacitor discharge instructions:th-cam.com/video/8YPX1gZGyJg/w-d-xo.html
Disconnect it CAREFULLY as the capacitor could be holding a charge!!!
Next... Hook the wires up the other way. It should then produce power. If it doesn't please contact our engineers on our website and they will guide you through the next step. :)
www.generatorguru.com
@@Generatorguru Thanks. I also wanted to ask about my surge power. My generator used to surge when I would plug in something big like a 5000 ac unit. But after storage and replacing the carb and capacitor it won't surge anymore. It still reads 115 volts but boggs on anything big. It's a 2000 surge 1500 continuous. It has almost no hours but was stored a long time.
It sounds like you might be overloading the alternator! Please set up a ticket with our engineers via our website. We can then assign you to the specialist on your model and they can do the full calculations for you. :)
generatorguru.zendesk.com/hc/en-us
P.s. We do NOT charge for this service
Good day, I have a LAUNTOP 5000 Diesel generator that is running but oil is spitting out through the fuel vent. Anyone have any idea what the problem maybe and how to fix it??? We don't have a manual and having problems finding one online.
Hi! What do you mean by the fuel vent? Did you mean Air filter vent?
If you have oil spitting out of anywhere on the top end then it probably is the Piston Rings failing, allowing the oil to rise in the cylinder. You need to remove the head and put a tablespoon of oil onto the piston and leave overnight. If the oil has disappeared you need to replace the piston rings. If it does not then it is probably diesel and the head will need carbon removal around the valves and the valves reseting. If you need the valve settings please contact our engineers on www.generatorguru.com/ask-the-guru/
Had the same issue yesterday.
Hi i need so help i have done a test as shown in the vid and i am getting a reading of 16.80 from the to wires does that mean the alternator is at fault
+steven jones the model i have is a s20w-95
+steven jones Please contact your local Generator Guru office. One of our engineers will run through the results with you. www.generatorguru.com
Thank you sir plz tell us connection diagram of this type of generator.
Dear Sir/Madam,
I am sorry to say we do not hold any manuals or wiring diagrams, as we are not affiliated with the manufacturer of this Generator. Instead, we work with the Manufacturers of the parts made to build the Generator.
But we have Engineers here who have worked on your Generator a number of times. If you have any questions we would be very happy to advise you.
@@Generatorguru ok. Thanks
Hi, I'm only getting 2 Vac from the wires going to my capacitor. BTW, my capacitor is a black rectangle. I assume that's the capacitor anyway.... Suggestions from this point ?
Hi there
We find 2V to be quite borderline, sometimes in these cases, fitting a new capacitor instantly restores the voltage, sometimes it can take a few minutes to get up to full output, sometimes replacing the capacitor doesn't restore the output and further work is needed, we really cannot say for sure
@@Generatorguru Hello, thank you for the reply. I tried a new capacitor with no change. Can you suggest where to go from here ?
Hi there
Did you run it a little while? Sometimes, the generator will re-excite itself gradually as you run it. If there is no change after 20 minutes or so, then follow the procedure in the video below
To re-excite your alternator, we suggest you only use this method, as described by Generac Generators on TH-cam: th-cam.com/video/-LR62sm7USU/w-d-xo.html
@@Generatorguru Thank you for the reply. I ran it tonite for 24 minutes, no change. Still only 2.4 vac output. Will watch your other video and continue. Couple other questions first.... How picky is the capacitor ? The one i bought is slightly different. Specs: 14uf +/- 5% 450vac. My original is 14 uf, 300 VAC. Also, because it is different, how critical is polarity ?
Hi there
It is the microfarad rating that is most critical, the voltage is less of an issue. Polarity shouldn't be an issue but you can try reversing the terminals, it sometimes does resolve the problem, capacitors are peculiar and picky items
i have a blue max 8000e no output to the plugs on either 110 or 220 v setting . the capacitor ears was broke off . i am getting 9.6v from the exciter circuit i am waiting on an exact replacement . if after replacing this it still has no output what do i do next
+brokenwrench1 Please contact your local Generator Guru office. One of our engineers will run through the results with you. www.generatorguru.com
where is capacitor in Loncin 9600 series i wont found and aftwr turning on nO powet supply what to do??
Usually, they are in the Alternator end casing. If not check behind the control panel. :)
I have a UST 5500 brushless generator and my capacitor keeps burning out and It doesn’t have an AVR and I cant find the problem. Any hint?
I am sure we can help. If you click here: www.generatorguru.com/need-help/ and go to Engineering>Alternator Issue>Need more help we can match you with the Engineer that specializes in your generator. He will be happy to assist you with the repair. :)
hi my name is john and I have master MGH 10000 portable generator and I am reading 70 to 80 volts out of the outlet Ben 10 volts across the whining any ideas
+john colling Please contact your local Generator Guru office. One of our engineers will run through the results with you. www.generatorguru.com
My brushless generator only puts out 170vac, tried new capacitor no difference, what would be the problem?
Pls contact our engineers on www.generatorguru.com/need-help/ and they will be happy to help. :)
I have a Vortex SE7200LX gas generator trying to find out who make it so i can buy parts
Send us a picture and we would be happy to identify it for you. See link :)
www.generatorguru.com/ask-the-guru/
So I checked my brushless generator (porter-cable bs525) and I'm only getting 0.5 to 0.6 v AC. I guess my alternator is dead. What and how much am I looking at to repair this?
Good news your alternator is NOT dead!
1st I would replace the capacitor. (You can purchase them on our website GeneratorGuru.com)
Then fit the new capacitor and run it for about 30 minutes. Often this can get the voltage to ramp up as the magnetism builds. If it still does not fix the problem then you will need to flash the windings. Let us know if this is required and we can get you the instructions.
Hello ive testested my brushless alternator and im getting 11 to 12 volt why is this my capasitor is 13uf is that too small for a 2.7kva stephil
It seems you Alternator has blown it's diode. If you take it to a Motor Rewind Shop, they should be able to fix it for you. The uf on your capacitor should be matched to the winding length and diameter of the wiring. These vary from design to design. It is always advisable to stay with the same uf. If you use another, it will change the power output and make it less stable.
My generator has a 50 uf. Can I put 47 uf and it still work
Soprry you need to match it within 5%. So you need a 47.5-52.5 uf. but a 50 uf will ensure correct operation so this is the best uf. If you need to buy we sell them on our site: www.generatorguru.com/capacitors/
Hi, I have Honda G300 Generator which is not producing an electric, what and how I can check the alternator whether it produce any voltage please?
G300 Is the Engine model so I would need to know more than this code to assist you with this query. But saying that this test can be run on all portable generators to test the health of the alternator before changing the capacitor or AVR (depending on which is fitted to your model.) If you can provide us with the model number or send us pictures of the end of the alternator with the cover removed, we can help you further. Please send pictures to us via our website contact us page: www.generatorguru.com
I am attaching some pictures for your consideration.
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Unfortunately, TH-cam will not let us see these pictures. Can you submit a ticket to us with the pictures and your questions please via our website. :)
www.generatorguru.com/ask-the-guru/
Capacitor was bad so I replaced it. Didn’t work. Tested voltage out of the leads to the capacitor and I am getting 18.6 volts??? Any help would be appreciated
It seems the Armature (rotor) diode has blown! You need to take the Armature (rotor) to a motor rewind shop and see if the can replace it. Alternatively, the manufacturer might sell replacement alternators, but be warned... They are expensive!!
@@Generatorguru thanks. I appreciate the help.
I tested my alternator and it's producing 15 to 20 volts. Does that mean it's bad? My generator is a 5500 porter cable brushless
Dear Will,
As your Alternator has failed the tests, you need to contact a local “Motor Rewind Company” to see if they can fix it. These companies can vary in price, so if you have time, it is worth getting a few quotes.
This is a much cheaper option than replacing the Alternator as the manufacturer charges over ½ the price of a new Generator and we would still need to get it shipped to you from China. Being so heavy, that would be very expensive and outweighs the economy of a new Alternator.
@@Generatorguru thank you