Lost the back box lights, everything else is working.. Searched all connections, looked at all the wiring.. can't find the issue.. thoughts?? Have a flipper coil going nuts right now also. Going to just replace that.
Thanks in advance!
It's probably the connector. Those bally connectors are shit.
Try "crimping" the female pins in the head a little bit with some pliers.
Also, check the board inside the cabinet near the tilt bob. There's a GI connector over there as well, and sometimes it burns "WPC style".
Bally also has very shitty fuse clips. You may need to replace those.
This is timely since I am now having this issue as well. Though my backbox lights come back sometimes after playing a few games.
I did notice while cleaning one of the stepper motors in the backbox, lifting one of the brushes while the game is on would get rid of the lights in the backbox.
So I will be checking the places CrazyLevi mentioned as well as polishing up the stepper in question again tonight.
I have had mine for about a month and still love it 
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