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Hi Art,
I have great respect for your talents and experience.
I didn't know the starter solenoid had two coils, one for engagement and one for holding. The solenoid coils I am familiar with have one winding. Counter EMF keeps the current from getting excessive when the plunger is pulled into place (for closing the contacts).
Since my starting problem happens only when the car is hot, in hot weather, I now suspect the termination on the end of the wire which actuates the solenoid. I am going to but a new crimp female spade fitting on it in a few minutes. The other wire junctions, and the neutral safety switch, don't get nearly as hot as the engine compartment.
I should have stated the mileage on the thirty-year-old car earlier, 423,xxx miles. That is a lot of cycles of starting and a lot of time. A long time ago I was working for an electrical contractor at a paper mill. We did new construction and maintenance. The paper mill would open up the motor control center buckets and take pictures, with an infrared camera, to find the warm terminations. During the annual shutdown I was given a stack of pictures showing the warm, or hot, terminations. I would have someone remove the old terminations and install new ones. Bad terminations looked fine. Only the IR photos would find the problems.
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john
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