Posted by madcat_1212 on June 19, 2018 at 02:54:40 from (47.54.217.227):
Hi All,
I am new to the forums as a poster, but have been lurking around for a while.
I have been troubleshooting a generator issue with my 1958 Farmall 460 diesel and am hoping that someone can weigh in on what they think the issue may be. The tractor is not charging and the batteries will die out on it periodically. Here is the outline of things I have done so far.
1) Bench tested generator off of tractor using the motor test. Connected negative battery cable to case of generator and positive battery cable to A terminal. Generator spins freely.
2) Performed the same test with the F field grounded to the case. This slowed the rotation of the generator.
3) I removed both leads on generator and started the tractor. I warmed it up and then tested the voltage at different engine speeds. Seems to increase from 1.5V to 3.5V with engine speed.
4) With both leads still off generator, I connected the A post to the F post with alligator clips. The voltage between the A post and the ground of the generator still varied between 1.5V to 3.5V. I was expecting the output voltage to be higher than this.
5) With both leads connected to the voltage regulator, the voltage output seems to be even lower, ranging from .2V to 1V.
Does this indicate that the generator may be failing? In one of the troubleshooting guides I read, it seemed to indicate that it could be faulty field coils?
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