Rollergames
Williams, 1990Rehabbing a Rollergames. Left flipper was dead on arrival. I replaced the flipper button switches and rebuilt all flippers with new coils. I rewired & soldered based on what was existing. Replaced F6 Fuse of which previous fuse was too large. LEFT FLIPPER IS STILL DEAD. Ideas of what to test next? Multimeter guidance is welcome. 
Rollergames
RESOLVED: It turned out to be my aftermarket replacement Interconnect board. This was the second location that was not pinned correctly to match factory connectors. Once it was the J10 for lower GI and this time it was the power to Left Flipper on J8. Found the unused pin that was hot and moved the corresponding wire to it on the connector.
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Downingtown, PA