Dear Steve;
Joe is correct. The solenoid MUST ground through the "governor". That protects the system; like he said.
You must shift the lever "in" to test also. That would be 'pushing' it to the rear of the tail housing.
I can't recall if the solenoid is active/inactive for operation.
Look it all up in a Motors Manual. This will help you learn how it functions etc. "Home brew" diagrams are fine, once you understand how it all works together. Trying to learn from them is NOT the 'way to go' and the relay was put there (factory) as a safety mechanism, like Joe explained.
You should find one (Motors) in your local Library.
Did you fill the rear housing with (SAE 90 EP) oil??
Good luck.
