Gosh, I can't thank you enough for your great answer. I have the tools and with your helpful advice will be able to fix this nagging issue.
Thanks again and have a wonderful Holiday.
Ok, feels like Deja-vu! I have the same problem. Of course, rather than diagnose the problem like you did I replaced the wiring harness and all of the sensors.
It started right up, ran great....then I turned it off and the problem has not been solved. What is really maddening is that the when I turn the key to start the yellow prong goes hot at the switch but not at the connection to the solenoid. I am thinking of just running a wire from the ignition switch to the solenoid and calling it a day.
Hope you figured this out.