Posted by Tim Crawford on July 28, 2013 at 12:54:56 from (65.30.176.104):
I have a 1954 Ford NAA, bought it two years ago. The amp meter on the tractor has never indicated that there was any current flow from the generator into the battery. When you turn the key on the amp meter reads about +4 amps,this is the opposite of what I would expect but it does give a reading. Then as I try to start it the ampere meter does move as the motor is being rolled over, again this is what I would expect. Once the tractor starts the ampere meter goes back to +1 amp and does not move, it sits at +1 amps when the tractor is shut off too. My thought was that the generator was bad or the voltage regulator is defective, but I have been able to determine that the generator is producing a charge. I have looked at the brushes, there is very little wear. So that being said I decided to buy a voltage regulator the one on the tractor looks to be pretty old. I bought a voltage regulator that would fit a 6-volt Ford NAA B circuit, it said it would also work 600, 700, 800, 900. I took the old one off and it had a rattle, I opened it up and one of the screws had fallen out of one of the plates. I decided to put the new one in since I had already bought it. I got the new one in and verified that the wires were hooked up correctly, ground was to the ground wire on the generator, the BAT was hooked into the terminal block, the FLD was connected to the field post on the generator, and the ARM was connected to the armature post on the generator. I then turned the key on and the ampere meter indicated +4 amps just like it did with the old voltage regulator. I then started the tractor. The ampere meter went back to +1 as it usually did and stayed there for about 5 seconds, then the needle jumped to -30 amps and stayed there for 15-20 seconds. The generator started to make some strange noises, and then the amp meter needle started to jump from -30 to -20, back to -30, down to -10, up to -30 it was all over the place and it would stay mostly at -30 amps but it stayed at other settings for 15-30 seconds at a time. I put a multimeter on the battery as the tractor was running and it indicated that the battery was getting 18-22 volt charge. I shut the tractor off and checked the generator and it was very hot. So I guessed I fried the voltage regulator some how. I went and bought another voltage regulator and very carefully installed it and verified the wiring was correct. I started the tractor and the very same thing happened! What is happening here? Do I have the wrong voltage regulator? Could it be bad wiring, a short in one of the wires? The wires are wrapped together in a harness so I can only see the ends and the ones connecting to the generator have a number of cracks in them. Are the my new voltage regulators reparable? I opened the one up and there was no sign of any damage, like melted wires everything looks fine. Could I have a mismatch with the generator and the voltage regulator, could I have an A-Circuit generator? The previous owner may have put an A-Circuit generator on the tractor not knowing? Is there a simple way I can tell what type of generator I have? There are a lot of questions here I hope someone can give me some advice on what to do next. Thanks.
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