Jims right that youre right,,,The armatures output is across the two fixed brushes that are 180 opposite, ones grounded the other leads to the ARM post, the Filed current (and resulting genny output) can be regulated by movement of the third brush (wires to first of the 2 series field windings), closer to the main the more current, farther away the less.
The dead grounding of the Field post by passes anY light switch etc problems and as Jim notes that makes her full charge so if she dont charge then I suspect a bad genny (still may be other causes) The troubleshooting he posted (try the motor test also) ought to help diagnose the problem but often the light switch may be inoperable or not be well grounded
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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