Quoted from KYBingo:Hunting for a short...Thanks for the directions.
The ball lifting issue went like this: Turn the game on, drop a nickel, two balls lift. If you were to shoot those balls into the play field, no other balls lift. To proceed drop another nickel and the game begins again. Two balls up.
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It sounds like your 'timer stepping unit' is stuck at the 2nd ball position.
Verify your Timer stepping unit is moving freely. The fingers on the wiper may be stuck on that particular rivet.
Remove the wiper assy. Clean rivets, and insure the fingers do not bind on any rivets.