Steve, thanks for the description of your double bulb testing rig.
This is a great thread, many thanks for your efforts. Over time through research and hands on I'm slowly figuring things out but it's no replacement for having a voice of experience giving a simple explanation of something that seems so complicated to those like myself.
I've got a gottlieb Top Score that will!not! kick! out! the! ball!!!.argggh! The 'O' relay never seems to get the pulse to operate the kicker coil. Its making me crazy because it did work, and then wouldn't, then did, now not at all. I'll build me a testing rig and try again.
willbeEM