I have been restoring a Flip Flop and I have a problem I cannot find a resolution for. When I power it on and start up a game the ball count lights work just fine. Lights are bright and advance when they are supposed to. After the first game and during the next the lights flicker out and stop working though the ball count unit still advances. . I have played with the ball count unit, tried to wiggle the spider to get the lights to at least flicker but doesn't work. I can get the lights to come back on by activating the game over relay and starting another game. I have been over the schematics and cannot find a cause.

I have cleaned and serviced the ball count unit. Checked continuity of the wires to the lights in the backbox. I am at a loss.

Thanks all! Got it figured out, It was the make or break switch on the GO relay. I had already cleaned and adjusted it but it was ever so slighty off so it would at times make an intermittent connection. It's solid now!

Now I have to figure out why I have one weak flipper and I have rebuilt it, New EOS switch. Next will check the wiring. It is the upper right flipper and the lower right one works fine so I know the circuit is OK.