Not really an update.
I did not get to look at the slot on Saturday. My neighbor had moved the harness to get it working and people were playing it. Someone hit 300 coins winner and the machine started paying out. But there were not enough coins in the hopper to payout, so it locked out.
None of us had every messed around inside to look for a reset switch. Finally noticed the bracket and rail between the coin hopper rails. It was loose and Tim was gonna tighten it, when I noticed the white cylinder through the plate near the neon lockout light. Viola! Lockout reset.
I will take time when I can to look at the connector, harness, and wiring in detail as soon as practical. I will take pictures.
thanks again, d.