As you know, the generator F terminal connects to the light switch, which grounds the field through the switch box cover, switch box, steering pedistal, tractor frame, then back to the generator case.
If any one of those half dozen spots where parts screw or bolt together has rust that prevents a good ground between the light switch case and generator case, the gen field will not be grounded and the generator will not charge.
If you run a new ground wire from the light switch body to the generator case, bypassing all those rusty joints, I bet your charging problem will go away permently.
As a test, temporarily connect a wire from the generator case to the light switch case and see if your generator comes to life.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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