I have been reading all over the forums but have had no luck finding a solution to my issue. I am working on a friend of mine's Williams Grand Prix and I cannot seem to get the machine to advance past player 1 ball one on a 2, 3 or 4 player game. However, it does work in a one player game (plays all 3 balls and goes to game over smoothly), and the machine has no problems adding up to 4 players. It just will not move to player 2 ball 1 etc etc.

I have checked the score motor switches 1-C and 2-C and they are gapped correctly.

I have cleaned and adjusted the player count unit, ball index unit and player up unit to no avail. They all work smoothly and have good contact. They all do their jobs in adding players, changing the ball index in a one player game and keeping track of which player is up. It just will not advance past player 1 ball one on a multiplayer game.

Any help will be greatly appreciated as this is the last issue from having it playing perfectly and I have been stumped for a couple of weeks at this point.