Installing a shaker motor in AC/DC, brand new parts. I actually read and followed the instructions--I know, shocking! Powered up, checked the game settings, played a couple games, nada. Completely dead.
Traced back through the wiring, everything looks correct. Proper connectors, no misaligned wires, everything connected tight. Pulled the motor and tested it on a bench supply at 12 VDC, it turns.
Found a meter and tested the supply voltage to the shaker driver board. According to the docs, power on the 7-pin connector should be 16 VAC but I'm seeing 8.3 VAC so that seems way off. Can someone with a shaker installed in a recent Stern verify the voltage across pins 1-7 on J1 of the motor driver board (#520-6803-00).