A charged battery is 12.9 volts. Alternator is supposed to go over 14 volts. System voltage when the engine is running should never drop below 13 volts.
Try sticking a nail in the back of the alternator - in the Delco "test port." That's what it's there for. If the alternator is good, but regulator not working - it will go to full charge rate when you use the port. If nothing happens, then the alternator itself is bad.
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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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