I agree with old. If the resistance of the idiot light circuit (lamp + connecting wiring) exceeds about 40 ohms the alternator will not "turn on". Temporarily bypassing the lamp as old suggests can confirm.
However it may simply be the alternator is being spun too slow. The 10SI - even in "3-wire" configuration - must be spun considerably beyond normal low idle speed briefly at startup before it will start to charge. And sometimes as an alternator gets older, it may need to be spun up faster it turn on than when it was new. (This may be why it tested OK on the NAPA test stand but won't work on your M.
Consequently may need to replace the alternator pulley with a smaller one in order to spin the alternator faster.
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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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