Bulkhead Connector Stripped Threads?
Hardware store had some 5/32 threaded nuts (but not square ended), so I put a nut on both terminals even though it was only the top terminal that I could not cinch down tight.
I also plugged in the Park/Neutral start lock-out wire into the solenoid "apparatus". Not quite sure yet how the factory got that wire down, routed, and secured on its way to the switch near the pan of the 904 transmission? It's just a loose wire doing its own thing.