Quoted from Mopar:It sounds like the Lock Relay isn't energizing which will make the
Game Over Relay energize. There may be more than one, but I'm
pretty sure there's a bump switch, like an anti-cheat switch in the
inside of the back of the machine. Probably on the side. It's two
switches with one of the switches having a small metal weight
at the end. Those switches need to be making good contact with
each other. I'm pretty sure 4 way is a late 50s (not 1953), so it
wouldn't be in the plugins unless there's also a bump switch in
the coin box. Your machine has two wooden front legs, right?
You could have something manually hold the Lock Relay in,
but when the machine is turned off, then back on, it wouldn't
go to game over as it should..