I recently purchased a Bally Old Chicago (1976) and am having an issue with the playfield lights - this issue is they won't light. Everything else appears to be in working order. Backglass lights up and all the features on the playfield seem to work. But none of the lights on the playfield are working.
I saw a similar post about this a few years ago and tried the remedies listed: I've checked the contacts on the Game Over Interlock Relay and the Tilt relay. All the fuses and fuse holders appear fine. I've also checked the Alternator Relay - in fact, after filing all the contacts, the coil now fires and seems to emit a humming noise when I start up a game. Not sure if that coil is supposed to fire on start up or not.
Any suggestions would be greatly appreciated! (Keep in mind I'm still relatively new to this...)