As I posted over on the GT Forum, when those are used in starter mode, they get a shot of "juice" from the battery to the "A" terminal the SAME as if you were manually polarizing the unit.
So, if it cranks the engine, it's NOT in need of polarization... it's already been done.
Try (for a short period of time) full-fielding the unit be grounding the "F" terminal on the generator. If it charges that way, it points to a bad regulator or a regulator that's not grounded properly.
One thing to look for... The regulators are rubber-mounted and have a little braided copper lead jumpered around the rubber mounts to provide grounding and sometimes those jumpers get damaged/broken/torn off.
Are you bale to check the charging voltage at the generator's "A" terminal with the engine running above idle to see if grounding the "F" terminal makes it charge?
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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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