My father has a Gottlieb Four Seasons four player. During game play when the group of top hole coils fire sometimes the decline coil on the player unit will also fire. This will then make the game change from player 1 to player 4 and scores will appear there. For example, I can manually put the ball in the top holes over and over again and watch the reverse coil on the player unit in the back box jiggle and jiggle until it finally pulls hard enough to change players.
There's not much to the player unit and I've cleaned the contacts and lightly lubed them with PBR grease. One thing though. The player unit has some very thin wires with black jackets that seem to be jumpers from one contact to another. Some of them are not connected. What are these for?
This issue seems to be some type of bleed over of signal from the top playfield hole kickers and the player unit that causes that coil to fire as well. I've traced wires and couldn't find anything touching. I've also cleaned and checked for misadjustment of the player switches, score switches and score motor switches. At this point I'm at a loss and need a new direction to look. Any help would be appreciated. Thanks.