A one wire , self exciting, alternator is designed to have only the one wire connected to the output terminal. If that is what you started with and it was overcharging there was a problem in the alternator. Three wire alternators with Delco regulators are designed to not charge if there is no voltage signal on the sense terminal even if there is voltage at the excite terminal. Voltage is needed at the sense terminal to turn on a transistor to allow the voltage from the excite terminal to get to the brushes. Aftermarket regulators may be designed without this "extra" transistor so they may overcharge without a voltage on the sense terminal.
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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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