Argh... Help please. Going crazy at the moment... lost all GI and I can't figure out why. Maybe I'm tired. Game plays 100% fine aside from GI being off. Inserts are all lighting fine and working, displays/scoring all good, targets, flippers, etc. all fine. I don't know if there's a short or a gap or what, it's driving me nuts.
So if I just run 120AC ONLY to the Rectifier, which feeds the transformer, which then feeds back all the necessary voltages to the Rectifier, I get all the normal test voltages perfectly fine. This includes the 7.3VAC on TP4. All good. If I test the actual header output pins on any of the GI Bus/Return lines, I also get 7.3VAC, like I should.
If I plug in ANY of the GI lines, the TP4 reading drops to zero, as does the reading on the output pins. I tried this with the "cabinet" GI line (just lights coin slots basically), the Playfield, and the Backbox GI lines. All have the same issue.
I tried simply hooking up a bulb to the output, and the same thing happens, as soon as something is actually connected to the 7.3VAC pins, it's like they shut down and the TP4 drops to zero.
No fuses are blowing or anything.
Thoughts? Hoping I'm just exhausted and missing the obvious.