Thanks Greg, I'm flying blind with this reply to you (because I don't understand how a generator really works) but I did some simple continuity tests (which I I generally understand). With reference to the last section of your link you provided (A or B circuit ??) .....
First, each of the two brushes (inside the far end of the generator) individually show continuity to ground (the generator case). This is not involving the F or A terminals on the generator, just a test from the brush wire itself to the case. Then, the two brushes show continuity between them as well in a separate check. I am assuming that one of those brushes should be insulated from the case, is that correct?
The field terminal on the generator has a wire leaving it inside and it goes to one of the big coils that surround the armature. That generator field terminal tests continuity to ground (the generator case) and also to both brushes in separate tests.
The armature terminal on the generator is wired directly to one of the two brushes. That armature terminal tests continuity to ground (the generator case) and also to both brushes (just like the field terminal did).
Something doesn't sound right to me if your link is saying that one of the two brushes should not ground to the case (or is not insulated).
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