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- เผยแพร่เมื่อ 24 ส.ค. 2024
- 120A Bosch alternator modified to 15.3v. A simple diode mod to give 15.3v instead of the factory 14.5v when charging a single lead acid battery (test only).
PLEASE NOTE: This is merely a proof of concept. The diode used in this video is only 3A rated and not enough on it's own for the field current at max load. After the video once fitted back to the engine, I swapped the diodes out to 2 parallel diodes in series (4x 3A diodes in total). This bumped the voltage up to about 15.8v at the alternator.
Expected field current is aprox. 6-8A max, so a single 3A diode could get very hot and blow quite quickly under heavy load.
I must also mention any modification you do to your alternator or vehicle is done so at your own risk and I am not responsible for the result. Thank you :)
Please read the video description - I should have mentioned the spec of the diode used in the video is under-spec. It is a 3A 100v diode, which IS NOT MAN ENOUGH. I will be changing the diode(s) to be able to handle the field winding current (about 8A) and will likely do a follow-up video once i have got it running on the vehicle.
Any updates?
I'm watching the beginning of a master, see you in 40 years mate. Cheers
15 v is over charging the battery.. 14 point 4 etc is normal charging, any thing greater is forcing more voltage into the battery. damaging it over time. pretty quickly
I have a Bosch Alternator ERR 5834 that has voltage output of 14.2V. I fitted a new calcium battery that requires charge voltage of 14.7 volts. How can I acheive this with a voltage regulator as you have shown?
Thanks for the video! I've been interested in the Ford smart alternators as they vary from 14-18v controlled some way
Sounds interesting! you can also get totally separate replacement regulator modules, but this is the cheap way for cheapskates like me :D thanks for watching
@@sootpig i have a bmw e36 with still stock alternator and i want to put a smaller pulley to increase voltage to about 15V
I am woreied car electronics will be damaged in some way
Will this slight increase in voltage cause any damage?
I have the ad244 4 pin ....can I hook up the excite wire with the diode straight to the coil
Just the kind of thing I like to do.
How can I upgrade the voltage on a mitsubishi alternator using diode?
How can we increase voltage if we don't have sense wire option or in self excited alternator?
Hy! I have a 150A bosch alternator. How many diodes i need to add for 15.4-15.6 current?
Thanks for the explanation, I never knew that touching 12v to the round side of the plug which I believe is pin 1 it would keep charging at the specified voltage predetermined in the VR itself, nice work around to get the higher voltage. Where would I find what the pin 2 is used for? Thanks in advance.
first place is 14V x 120A =1680 W now is 15,3V x 120A = 1836W is that right?
Hi does it matter which terminal you connect the wire for the bypass what you did B2+ B1+
Would you show on here the 4x 3amp diods you ran parrel as im confused how you have attached to the alternator thankyou
On a 240D running ac wipers headlights steroe with no ignition system and you want to compensate all the load using a potentiometer knob on the dash to dial up the voltage as the voltage guage drops into the 1p.5,11.v range is that a viable application to ovoid running your battery down? Were the standard 55 amp alternator is not keeping up with the load
Hello dude look i have the same alternator with you.
my car have 70amp i want to upgrade with this but the problem my car have one cable the blue no two do you if i Conect Somewhat
Thanks
Wouldn't that be the same as putting diodes in line with sense wire?
Excellent explanation, great video. Thank you.
Hi. I see that it’s an old post!
Is the modification still working and are there any detrimental effects to carrying out this procedure that have emerged?
Thanks for posting, could be very useful to properly charge my calcium cranking battery.
Still working, but the car isn't used very often (drag car only) but yeah, seems to be working fine.
How cN i do this on a 2014 charger 3.6l v6?
Good video! Can that Alternator be modified to fill 29V?!
Can it work an my Honda odyssey’s touring alternator
2:50 are both nuts a positive?
Hi, If you do this upgrade.... on a "Slow spinning alternator" that's "maxed out" will it still up the volts ???
No one is replying to this... must be a really dumb question?
Yes
Lol hmmm must be!!!
Nice vid..I have a stock denso 90a alt, it reads 13.5 v What can I do to get 14.4-14.8v? And is there anyway I can increase the Amp output for a bigger car stereo, (Battery- Northstar agm 92ah, Toyota - 121 nze engine) Thanks.
Add 2 diodes for desired voltage. You can increase amp output at idle with a smaller pulley. You can increase overall output by having the alt rewired but theres a limit to this and can sometimes lower idle output. Before doing any of that make sure to get a big3 upgrade.
Overall depends on the wattage of your system, if it's gonna be like 1200w then just get a beafier alternator
can you do a video of how to deregulate a alternator
What size diodes would you use to get a charging rate of 14.4-14.7? I have dual northstar agm deep cycle batteries in my jeep wrangler and the stock alt only charges at 13.98-14.1v. Manufactorer of the batteries states they need at least 14.4v to properly charge. Stock alt is 160amp and have done a big 7 upgrade in 1/0 fine strand cable
A single silicone diode would give you around 0.7v drop depending on the spec. Which might be a little too much for your AGM battery.
You could try a schottky diode as these are typically lower voltage drop than a silicone diode.
But you'd need to know how much field current would be flowing through the diode, as current flow effects voltage drop.
The larger schottky diodes (5-10A rated) are typically ~0.5v forward bias (voltage drop) when operating in their ideal current range.
goodjob
Thx alot for a great video. I’m currently struggling problem with two battery setup in my vw transporter. I have diode isolator between batteries and alternator connected to the isolator. But the problem is that diode 0,4-0,6 voltage drop. The charge indicator light pops up and battery isn’t fully charged. This might be the solution for it.
Why not just use a split charge relay?
@@sootpig because I want totally isolate. So batteries can be different condition and age.
Yeah!! I managed to get it work. I used 4 x 3A diodes. Only problem I still have is an issue with the exite. But I made button that connects battery and alternator when pressed
Did your alternator loose any current while increasing voltage?
This will not cause you to lose current its just going to slightly lift the voltage setpoint put on the alternator. If you were to bypass the regulator then the alternator could easily put out dozens of volts.
Slightly lifting the voltage like this will safely increase the voltage as to not damage yourself or your vehicles components.
Thanks I genus 😀
Did you ever get this sorted?
Good
Would you be able to put a potentiometer in the place of your diode pack?
No. Too much current for a pot, and you're looking for a fixed volt drop, the volt drop across the pot will change with field current so the voltage would fluctuate.
Gotcha I was only talking about the exciter wire so you can potentially adjust what the alternator "sees"?
At approx 415 in the video
Can do this on VAG alternators?
^^ what he said ^^
So what size diodes can be used to keep volta under 15?
Standard voltage is 14.2 so a single silicone diode will bring it up about 0.5-0.7v to 14.7 - 15v ish.
What is a silicone diode
I just had an awesome idea, could the alternator power the drill to power the alternator?
nope. Energy would be lost in the form of waste heat. No such thing as free power.
v n
i think its not good idea make over 14.5 v can burn all other electrical device in the car , cause of that they did not make over 14.5v .......but well be very nice if you can make diode diagram not go over 14.5 . so well be the same regulator ,if regulator burn .maybe we can take strong diode from old oven cause they are very strong ,fex.
Explain more are u talking about a toster over or toster?
What will be marked on the diode (amperage, voltage etc.)
All car modules are rated for 15 volts conservatively.
@@MrS22222 16 volts actually.
Hi I need your help how can I contact you