Maybe they’re all burnt out.

I powered up my Twilight Zone after moving to a new house and none of the flashers worked. I started checking voltages and cabling. What could have happened?

Flasher bulbs are a bit delicate. The move broke all of them. They were burned out.

When I bought my High Speed, none of the flashers worked. We started checking the large under-playfield resistors. We broke one in the process. Replacing it fixed nothing.

Flasher bulbs burn out and on High Speed, some are wired in series. They were burned out.

Chris told me about working on a home-model game that was showing some massive failure in the lighting, but on closer examination, all the bulbs were burned out.

Always check the easy stuff first!