Losing switched power and other #$%&^# electrical issues. HELP!

Mopar to ya said
I have 12V at all four terminals key on, but lose all power to all four terminals on cranking. I jumpered the ballast years ago, it supplies full power, not stepped down power. At least when everything is working. I replaced the ballast anyway since I had one. No surprise, it made no difference.
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Got it. Are you using the original/factory cranking power source wiring config? If so I can trace it back in my 73 fsm and figure out where to check for power next. I know you're not all factory from your original post, but id be happy to do that for you.