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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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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