If your wiring is good you may have an alternator that is not working properly or a bad relay in the regulator. If the alternator is working properly you should have over 6 volts on the R terminal at the alternator. That voltage from the alternator closes the relay in the regulator and turns off the indicator light. When the relay closes it also provides battery voltage to the field windings in the alternator.
If the relay does not work the power to the alternator field coils is provided through the indicator lamp and the resistor at the regulator. Since that circuit provides less than battery voltage it can keep the alternator from reaching its full output.
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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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