Farmall Super A Voltage Regulator Problems

Farmall Super A, AV, 100, 130, & 140 1939 - 1973
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Joined: Tue Apr 19, 2022 7:17 am
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Farmall Super A Voltage Regulator Problems

Postby dalton.scism » Tue Apr 19, 2022 7:35 am

I have a Farmall Super A that does not charge. I have been using it for some time by just running off the battery, but am currently working on getting it to charge. I had the generator rebuilt, and know it is functioning properly as I have connected it to a power source and it turns. I know that the problem is coming from the regulator, as when I bridge the field terminal to ground, the ammeter shows a charge.

Here is the dilemma...

I have replaced the regulator twice now, and they have both worked the first time I ran the tractor, but afterwards fail to function. I have polarized the generator before running the tractor. Both of the regulators I have purchased were NAPA parts.

With that said, am I just getting bad parts? Or, is there a problem with my machine causing the regulator to go out.

Additionally, where should I get a new regulator?

The tractor is original 6 volt positive ground. However, when I purchased it, the battery was wired as negative ground. I have since wired the battery properly, though.

Thanks to everyone for any and all help that will be provided!

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Re: Farmall Super A Voltage Regulator Problems

Postby indy61 » Tue Apr 19, 2022 12:16 pm

I've heard bad things about the cheap aftermarket voltage regulators. Make sure to buy the premium quality, Made in the USA.
I don't know the year of your tractor or type of regulator you need but here are some examples. ... r-premium/ ... sionRank=1

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