8n Ford Charging Problem

Jim R · Oct 23, 2014

I have a 1948 8n Ford tractor that I recently bought. This is my first old Ford tractor. My ammeter started going back and forth between charge and discharge. I checked voltage on the generator and it checked out OK. I replaced the voltage regulator and polarized it per the instructions, I ran a jumper wire from the Batt. to the Arm. contact and got a little spark as the instructions said. The tractor is still acting just like before, and going back and forth between charge and discharge. If it goes to discharge, you can tap the outside of the regulator and it will go back to charge for a little bit, and may stay there for a while or it might go right back to discharge, no ryme or reason to whats happening. The tractor is a 6 volt positive ground and I have checked the voltage regulator for a good ground. Can any of you Ford guys out there give me any advise as to what to check next??? I'm about to throw up my hands and load the tractor up and take it to town to the local gerenator shop and let him deal with it, but I have to take a day off work to do that. Thanks for any advise!!!

souNdguy · Oct 23, 2014

asuming you have not put a cheap ammeter on recently, then it could be you are seeing worn jumpy brushes.

try a full field test onthe genny. ground field.. see if you get better charge in the positive, even if it jumps a lil. if yes, then popping gthe genny open for a look at the brushes might be in order.

lha · Oct 23, 2014

That might be a good idea if your town has a real generator shop. I would watch what he does and ask questions. That is assuming that you don't have much experience with generators and old style regulators. I've owned many cars and trucks with generators and separate regulators,and one with 6v pos. ground,a '48 Dodge truck. I rebrushed it one time on the side of the road,and was lucky an auto parts store had the brushes! lha

Jim R · Oct 23, 2014

Thanks for the advise! I think I will remove the generator and take it to the local shop(and we do have a great generator/starter rebuilder in town) and get it checked out as it sounds like brushes might be the problem. I really appreciate the input!!

8n Ford Charging Problem

Jim R

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souNdguy

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lha

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Jim R

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