Wow, y'all are brutal on the pics! I trained you well Staying up (yet again) way too late just so I can work on pics as I sip a celebratory Glenlivet
I found the culprit on the ignition feeds. As always, walking away from it and coming back with a clear head was the trick. Last night after I got the fuel pump and starter working and after I realized the issue with the pressure regulator, I worked on the wiring some more to thin out things from the CJ side even better.
I was really puzzled tonight because I thought I only cut things out since I had it running right, then it hit me... the voltmeter. I wired the voltmeter feed that used to run to the CJ alternator plug into the batt + post on the PDC thinking that it would see the battery voltage when the engine was off and the alternator voltage when it was on. Well it did, but (thanks to the sweet dash wiring AMC did) it also back-fed all kinds of things, one of which was the start-run feed on the ignition switch. Unhooked that and everything is back as it should be. I don't know where I'll hook the voltmeter now, maybe tap one of the four non-power wires coming off the alternator through it's plug into the engine bay harness... no biggie for now.
I thought about video but Laura was already asleep by the time I got it running and it is LOUD, so I thought better of it. Maybe tomorrow morning
Pics coming next.