"Have you taken the positive post clamp off and cleaned the connections that are associated with the clamp bolt? I’m thinking that any corrosion could inhibit the delivery of the needed amperage to trigger the solenoid."

No corrosion observed. There could be some inside the crimped wire terminal on the wire leading to the ignition switch, but nothing observed externally and no swollen crimp fitting.

"Have you tried moving the gear selector into neutral and trying to start the car with it in that position? Or perhaps moving the selector a bit on each side of neutral while holding the key in the start position?"

I sure have tried that, but there is no change.

Thanks for the suggestions.

--
john