Gottlieb Gridiron randomly switching players.....

Swillie

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Hey everyone, my Dad has a nice Gottlieb Gridiron EM. What it is doing is as you are still playing a ball it will suddenly switch and start scoring for the other player, sometimes jumping back and forth multiple times in one play. Im not certain but I believe this happens only when you are playing a 2 player game. I have been saying for a while I am going to try and figure it out but haven't found the time. I am guessing it is probably just a switch that is slightly out of contact, probably not holding closed enough but that is just a wild guess to give me a starting point.

If anyone has some insite as to what the problem could be or which relay bank to look at I would appreciate it. I would like to go over there with a plan. I was planning to watch for which relays move when the ball drops out of the playfield on a two player game and check those switches first. That is how I have managed to figure out what does what in my EM machines.
 
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