overvoltage charging NAA

steveroth

New User
I have a jubilee that was converted to 12v by someone else.

It charges at more than 16 volts, thats all the higher my installed voltmeter shows.

I replaced the alternator, as its a single wire GM with a built in regulator. Same.

I changed to another battery. Same.

I replaced both the battery cables, plus added a ground strap from the alternator to the block. Same

I fried a coil, so I got another and this one is pretty well done now too.

As nearly as I can tell, there is NO resistor in this circuit anywhere. Should there be?

Would anyone recommend that I install a different alternator and an external voltage regulator (which I already have)?
 
(quoted from post at 16:46:32 08/04/16) I would recommend trying a different voltmeter.

Well I think you are correct. The really odd thing is, when the key is on but the tractor is not running, the voltmeter is right.

When the tractor is running, the voltmeter is crazy. I ended up replacing with an ammeter. I still question that everything is right, because as soon as I start it up it shows 15 amps charging, and I know the battery is not needing that kind of charge.

I did get a good multi meter reading of 14.55 at the battery, and roughly the same at the alternator with the tractor running.

It still seems like something is pulling a bunch of amps. There is nothing on this tractor but 2 headlights.

Maybe its ok. Interested in opinions though.
 
Charging voltage is within setup range (good). Within first few minutes of start up, the alternator will be restoring energy used by starter during startup & will typically show higher charge current than after running awhile.
 

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