Posted by pete 23 on December 05, 2012 at 16:57:07 from (74.32.238.2):
In Reply to: voltage regulator posted by Ellis Kinney on December 05, 2012 at 14:45:08:
I know what I would do. Test the field current draw. You didn't say what model tractor you have but I am going to assume it is an older one like farmall h or m or something like that. The old generators that used a high low charge switch had a much lower resistance field coil windings and would draw about 4 amps on a bench test with 6 volts. That is too much for the voltage regulator points to handle and they arc and burn. Two and half amps would be closer to what a voltage regulator can handle. I actually hate 3 brush generators but one has to use what he is handed. A good shunt wound generator,(two brush) causes much less regulator problems. IH finally went to using them for the last new replacement generators on the 350, 450 etc and which early models were still six volts. Much better, but the correct non adjustable 3 brush generator , made for a tractor with a regulator will work. I fought them for many years as most customers insisted it always worked before, why not now. Well, today's regulators are not the same so it only gets worse. One other thing about adjustable 3rd brush generators, when you adjust them to produce more amps that also increases voltage to field which in turn puts more amps through fields. I have see more than one actually melt the wires off the field coil because a guy put that brush so close to the main brush trying to carry more lights when he had a high low charge switch.
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