If it's REALLY a 1-wire alternator it doesn't need to be externally excited.
The voltage tells it all. You should be seeing 13.5 to a little over 14 Volts and you're NOT, so the alternator is BAD or there's an "open" between the output stud on the alternator and the (+) post on the battery.
To rule out an open circuit, with the engine running at mid-throttle and the lights "ON", check the voltage at the (+) battery post AND the output stud on the alternator. They should read within a fraction of a Volt of each other and be in the 13.5 to a little over 14 Volt range.
If voltage is LOW at both places the alternator is BAD.
BTW, is the belt snug and the belt and pulleys in good condition (belt not bottoming in any of the pulleys)?
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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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