Charging system help

A

asand211

Active member
Good afternoon!

My grandfather purchased a 1953 Farmall Cub new in 1953. He was born in 1900 and passed away in 1994 at 94 years old. Believe it or not, he plowed his field with the Cub the day he passed away. I was lucky enough to get the Cub after he passed and I restored it around 2005. I have had an issue with the hydraulic block which I rebuilt twice. Since I do not have plows on it I haven't gone back into it. The current issue I need help with I recently found the system is not charging. If I disconnect the negative battery cable while the tractor is running it will die. I have watched a few videos on testing the generator and the voltage regulator. It still has the reverse polarity 6 volts system. If the generator is the issue is it repairable? If it is the regulator should I just buy an aftermarket part? Thank you in advance and I will appreciate any testing tips I receive.
 
asand211 said:
If I disconnect the negative battery cable while the tractor is running it will die.
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Hi,
They have said on here to not disconnect any battery cables when the engine is running, it can damage the generator. The generated power has no place to go if the battery is disconnected.
The voltage regulator usually has 2 sets of points in it. They can get burned from use, and then the regulator doesn't work.
If after using the flow chart above it shows the voltage regulator is the problem, you can try removing the cover from the regulator, and filing the points. Wipe off all filings with a clean rag, especially between the points. Sometimes they work, and sometimes they don't work after filing the points.
Disconnect the battery ground cable first, when working on the electrical system, to avoid shorting the system. :)
 
Last edited:
Glen said:
Hi,
They have said on here to not disconnect any battery cables when the engine is running, it can damage the generator. The generated power has no place to go if the battery is disconnected.
The voltage regulator usually has 2 sets of points in it. They can get burned from use, and then the regulator doesn't work.
If after using the flow chart above it shows the voltage regulator is the problem, you can try removing the cover from the regulator, and filing the points. Wipe off all filings with a clean rag, especially between the points. Sometimes they work, and sometimes they don't work after filing the points.
Disconnect the battery ground cable first, to avoid shorting the system. :)
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Okay, thank you for the tip. I did that based on a video of that lady who makes all of the Farmall videos showing how to diagnose and repair cubs.
 
The flow chart TST is your best bet. In my experience, it is 75% regulator, 25% generator.


I have had very poor luck with the $30-$50 regulators. You can source from Brillman https://brillman.com/ or napa VR 6 v VR851 or other places offer high-quality units, but it is more like $150-175
 
inairam said:
The flow chart TST is your best bet. In my experience, it is 75% regulator, 25% generator.


I have had very poor luck with the $30-$50 regulators. You can source from Brillman https://brillman.com/ or napa VR 6 v VR851 or other places offer high-quality units, but it is more like $150-175
Click to expand...
I’d rather spend the money now and not have to replace it again in the near future.
 
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