Williams System 9-11, Data East - Special Solenoid Switch Tester

To manually drive the Special Solenoids from the J18 (C18 for DE)

Pull the J18 connector and install the Special Solenoid Switch Tester on the J18 header.  Works when in game, or diagnostic mode (such as Switch Test).  Warning: The coil will remain energized as long as the switch is depressed.  Do not hold the switch down.

https://youtu.be/iYS_GBgw9vU

BE9