So this time it wasn’t me.
buddy of mine, 1968 dart. He’d wired the ammeter wires together and bypassed the missing gauge. Somehow, those wires touched the metal frame of the dash very briefly, just enough to soften the insulation. But now, no power in the harness. Replaced all fuses. Still nada. All connections are connected and not burnt thru anywhere.
What could have popped?