There are 3 relays when looking Inside the game from the back at the upper left corner of the cabinet (to the left of the coin door). 2 of the relays are the lights and the 3rd one is the shaker motor. Make sure they are all plugged in and connected all the way up to the motor itself. Most disconnect it as it cracks the housing in half and destroys the wood panel. Two of the relays look the same, the shaker relay is the only 1 that looks different.