RUN- - - -do not walk away from that style of alternator. When they were brand new in 1965 they were junk, and time hasn't made them any better. The external regulators give a truckload of problems and you need an idiot light or at least a 100 ohm resistor in the circuit to energize the alternator field circuit. Get a 10-SI type alternator with an internal regulator and a simple 2-wire exciter harness to make it work properly. I'm about 40 miles from Estill Springs- - - -get the right alternator and I'll be glad to help you wire it up.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!