If its 6 volts it was probably Pos ground when new although the genny can still charge at EITHER polarity once Polarized while ammeter leads needs reversed or else it would read backwards.
Once you get it wired right and decide on your polarity (Id stay at Pos if its 6 volts) be sure to Polarize the genny BEFORE starting.
Once thats all done heres a Troubleshooting Procedure for non charging
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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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