OK Rich - you're set up is for one-wire alternator. But that "self-energizing" plug is a new one on me(!).
OTOH if that plug contains only a 148 ohm resistor it should NOT get even warm to the touch when supplied by 12 volts. This suggests perhaps the plug itself has shorted. You might try removing the plug and using VOM to measure the actual resistance across the plug terminals.
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Incidentally I've met Jim at Agri-Services several times - he's a good man who knows his electrical stuff. Might be worth another call to him regarding your problem.
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