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Battery Charger rewire help

Fleethirte

Aug 23, 2022
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Aug 23, 2022
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So I have a battery charger that has quit working.
I am pretty sure it’s the control / charge board.
Transformer seems fine!
My question is, why do I need to bypass the control board and basically just use the transformer manually.

Battery charger is 2,40 and 200 amp unit.

My initial thinking is to put a bridge rectifier on the dc output of the transformer and it should be gtg…. However I am sure it’s not that simple…..
 

Minder

Apr 24, 2015
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Apr 24, 2015
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3,318
Not quite that simple, most decent chargers use a controlled-charge circuit that senses when the attached battery is up to charge and regulates the charge accordingly by lowering the current output.
 

Kiwi

Jan 28, 2013
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Jan 28, 2013
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424
"200 amp", that is a serious battery charger.
 

ivak245

Jun 11, 2021
59
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Jun 11, 2021
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59
The output of the transformer is AC- then it becomes DC after being rectified. Not really sure what you are trying to do here. And 200 Amps? That transformer would be as big as a washing machine!
 

Minder

Apr 24, 2015
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Not really sure what you are trying to do here. And 200 Amps?
The OP appears to intend bypassing the defective regulation circuit and going directly off the rectified DC ! ?
Not a good idea.
 

Externet

Aug 24, 2009
838
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Aug 24, 2009
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838
IF the regulation control circuit has a problem.
Modern battery chargers have circuitry to recognize the battery to be charged is good and not a defunct thing extracted out of the backyard weeds. Can easily mislead users.
Before performing any surgery, try it with a known healthy battery connected to it. After that we can suggest something.
Remember a lead acid battery that has kept discharged over 24 hours will never recover full capability.

---> Have you ever read its manual ?
 

kellys_eye

Jun 25, 2010
5,095
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Jun 25, 2010
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If it really is a 200A charger then the controller is absolutely necessary to save the wiring, the battery and the user from potentially dangerous overloads. Bypassing it is not a good thing to attempt and we wouldn't condone such actions anyway.

If it's a typo and only 20A, well, that's still an issue and a good current capable of starting fires......

Give us the make/model number and post pics of the unit and the control board....
 
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