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overcharge!

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SteveR(OH)

New User
I bought a tractor that had been converted to 12v, and it started to overcharge the battery.

I was advised the single wire generator has a built in regulator and that was the issue, so I replaced it. Same. Still 14 volts.

Was told to run a ground wire from generator housing to the block, and did that. Same.

Took the generator back to NAPA to have it tested and it tested good. Put it back on.

Ran jumper cable from generator housing directly to the battery. Same

Any suggestions?
 
Maybe I am incorrect, but a fully charged 12V battery reads 12.5, and if I connect the meter to a 12V system working properly, it can read 13.5 to 14 volts, never thought that was overcharging on a 12V system.
 
(quoted from post at 13:17:28 04/21/15) Maybe I am incorrect, but a fully charged 12V battery reads 12.5, and if I connect the meter to a 12V system working properly, it can read 13.5 to 14 volts, never thought that was overcharging on a 12V system.
Click to expand...
t is not. GM acceptable charging voltage range is 13.5 to 15.2. If adjustable, set to 14.2 to14.6. Straight from GM shop manual.
 
A good working Alternator will charge a 12v system at 14v, this allows it to run off of the Alternator and be able to charge the battery at the same time.

I would assume the a generator would be the same. But that's just a guess, and could be wrong.
 
If that is the voltage measured while running/charging, your system is working fine. Minimum charging voltage on a 12V system should be around 13.8 volts while the max is approximately 15V.
 
Just for your info you stand about a 99.9% chance you have an alternator never yet heard of a generator with an internal regulator.
 
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