How to Test Vehicle Alternator with Multimeter!
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- เผยแพร่เมื่อ 12 ก.ย. 2024
- Vehicle Alternator's are a major part of having a safe and normal functioning vehicle. Over time your Alternator may begin to fail and need to be tested. This video shows you how to test a Vehicle Alternator using a Multimeter to be sure it’s working properly.
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Another easy method: first check voltage of battery with engine off then recheck the battery with engine on , if the voltage increases that means the alternator is working and charging. So your method tells you there is power to the alternator but doesn't tell you that the actual alternator is working. By doing the method mentioned above, you will hit two birds with one stone. Thank you
Thanks for helpful tips, may use this. You're welcome! Please subscribe like and share and check out our other helpfull videos
Perfect. This is exactly what I was looking for. And straight to the point too! Thanks.
Thanks mate! I can now pin point whether it's the alternator or a break in the wires along the way to the battery. I was never taught that you can check this way only at the battery site. Awesome vid! Very helpful. These days it's too expensive to take to mechanics, they said it was my battery and I bought a new Bosch from them for $300 dollars plus their charge to look at it $185. Didn't fix the problem so I'm not going back for more problems. Thanks again. I'll continue to educate myself and figure it out. It's too expensive to have these problems these days even though I'm a worker.
Your welcome , yes agree the more you learn the more time and money u save. Hope u fix problem.
Finally a straight to the point video thanks
Your welcome glad could help please subscribe like and share and check our my other helpfull videos.
Thanks brother! Excellent video! I need to do this test quickly because a storm is coming and my tractor is in the field and won’t start. I just put in a new battery and it started just fine throughout the day. Thanks for the quick and to the point video!!!
Your welcome hope all works out. Please subscribe like and share and check out our other helpfull videos
If my car doesn't start then how could I test alternator?
I'm learning tonnes from your channel.
Cheers from the U.K.
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Thank u I've always had a hard time understanding how to use one for testing
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When checking the alternator output voltage make sure everything is off especially the automatic switch on the vw cc ! If anything is on the alternator voltage will be less than 14 volts .Cheers Eddie
Thanks for tip. Please like subscribe and share
Thank you for this quick straight to the point video! 👍👍
Your welcome
Thank you for a simple short and to the point video 💯🙏
You're welcome! Glad could help Please subscribe like and share and check out our other helpfull videos
This is what I was looking for. The engine noise was a bit much but otherwise a good video indeed. Thanks...
Glad it helped
Just what I was looking for. Thank you, sir.
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Thanks for the help, will be testing my alternator shortly.
Short and to the point. Sweet! Thanks!
Thank you! Great video...simple and to the point 👍
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Great video - what I needed. But I was so nervous the leads of the multimeter were going to fall into the belt when you started the car like that.
Lol yea using clips would help
Thank you! Straight to the point.
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Very good job explaining. How do I check the connection from the alternator and battery?
This was helpful thank you ❤
Glad it was helpful!
This was so helpful, thank you for posting 🤜🤛
You're welcome
Great video. Thanks!
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Simple and easy! Good video
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Thank you sir! Much appreciated
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if i get less than 14, like 12.50 does that mean I have a bad alternator?
If your vehicle is not having any power problems, then it should be fine.
Very good teaching thanks
You are welcome
Some alternators only start charging once the RPMs are above idle. Such as my boat alternators. Just an FYI. my voltage will pretty much read what my batteries voltage until I rev up the RPMS above 800RPM. Then the alternator sends 14v to the batteries.
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Perfect. Quick and effective Thanks!!!!!!!!!!
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This was a GREAT help!!!
You're very welcome! Glad I could help. Please subscribe like and share and check out our other helpfull videos
Thank you bro! No BS!
You're welcome glad could help.
I find that my alternator has the same voltage as the battery (about 12.6), would that mean that I can disregard bad connectors and such as a problem and that the problem simply must be that I have to replace the alternator? Or can there still be other possible reasons for it?
If your vehicle is not charging correctly, then it's most likely a bad alternatetor. Please like subscribe and share.
Thanks Bro
I needed to see if this is how you do it. I am not sure whether alternator went bad or a connection is bad. Battery is good but alternator doesn't charge. It's a brand new alternator.
Have a video up showing how to test alternatetor. please subscribe like and share and check out our other helpfull videos.
Thanks man, good video.
Good video thanks!!
Question
How do you go about diagnosing a car that had a battery replaced but comes back weeks later due to the car not being able to start unless if it’s jump started -
Brand new battery was put on so maybe it’s a bad battery or a parasitic draw or a bad alternator or a bad or loose cable if I use a multimeter to test the battery while the car is on and it reads 12.4v that would most likely mean that the alternator isn’t charging the battery because if it was it would be over 14v+ with the battery reading 12v with the car on it would be safe to assume that it’s probably a bad alternator but what if it isn’t and I install an alternator and it still reads 12v how do I go about diagnosing it do I put the test leads on the alternator and ground cable to see if it reads 14v and if it does it means it’s good but if it doesn’t it means it’s bad like in this video how do I go about testing cables I guess I’m just wondering how you would go about diagnosing a car that comes in with a new battery that was replaced but dies weeks later and doesn’t turn on unless if jumped and the battery reads 12 v with the car running with a multimeter what do you test next ? I’m learning how to work on cars and I really want to learn how to diagnose
Most likely its your alternatetor. You can take it to Auto Zone and have them test it. Please like subscribe and share.
Thank you for sharing, very helpful. 👍
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Thanks for this video. Pro tip, don't leave your multimeter resting above the fan belt/water pump and belts when you start your vehicle! Depending on the size of your engine and how much it rattles or roars when you start it, It could topple down and become mincemeat. Effectively destroying your fan, shroud, belt system, and maybe even bend or break some other things along the way. You also don't want too much wire hanging down when you start the vehicle. I would just follow all these steps, just don't introduce the multi meter until you're ready to use it.
Thanks for tip
Great Job 😉👍🏽
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How many Amps is alternator putting out?????? volts dont tell the whole story
Thanks dude.
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I wanted to do this test on my car, but the alternator is too low down in the engine bay, can't reach down there with other parts in the way.
There's another video that says the test should be done backwards. In other words the black on the alternator cable and the red on the casing, which one of you is correct?
Couldn't you make the same measurement, with the engine running, but instead of AT the alternator, take the measurement at the battery terminals? That way you could rule out that there is something wrong/faulty in the wiring, or at the alternator for that matter and know the voltage that is truly making it to the battery. And if after running the engine for a while, say 30', and check the battery again, and if it is low or lower than 12 V then you'd know it was the battery is bad. Replacing the battery is less work and cheaper too.
Yes agree 👍🏿
thanks a lot appreciate it
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Just what I was looking for!
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would a bad alternator make your car surge at a stop signed ?
Yes can cause this. please subscribe like and share and check out our other helpfull videos.
I keep getting around 12.8. And I just changed the alternator yesterday. Do you think it’s a bad alternator?
Thank you 🍻👍
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what car is that ? i love the location of that alternator ! so easy to remove. On my car , had to remove both rad fans , front right tire , splash shield and dipstick to remove it. A real PITA !
Yea some are a. Real pain this is a chevy avalanche. please subscribe like and share and check our my other helpfull videos.
Thanks🤙
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Does the car have to be turned on to test the alternator like that?
Yes
Hi is 13.59 good for an alternator in a 2010 4cl Camry?
I did this and the alternator was reading between 13.55 and 13.70. does that mean its not working optimally? The car occasionally has trouble starting.
What voltage should the alternator go down to , to know its bad
With the vehicle running I checked at the battery terminals with a voltmeter, and got 13.95 , do you think I might need a alternator
How do u check the alternator if the car doesn start?
Can't you just check it on the battery terminals?
How can i test the alternator when my car wont start?
What if your car won’t start?
Do not need that if you disconnect the battery while the car is running and it stop alternator is no good
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My car doesnt start how can I test
If it doesn't start you'll have to take it off and have it tested. You have a battery issue. Please like subscribe and share.
does the vehicle have to be on to check? Can you do the test with the vehicle off and if it reads anything then it’s a defect?
Im not the smartest, but if an alternator isnt working properly, the car wouldnt be running? So whats the point of checking it? Or if the voltage on the battery is 14.7v while car is running, it would show the alternator is ok?
Multmeter
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