It's worth a shot, trying out your wiring. But to timeline my problem a bit, the car ran mostly fine for several months with the replacement amp wired as-is. The non-running started after I swapped the plug wires (to reference the original post topic). The car would run like a top for a half hour or so, then stall and die randomly fairly consistently once it was warm. Just as randomly it would start right back up and run as though there hadn't been an issue. I thought it could've been overheating plug wires? One of the mechanics I visited said the wires were not always to spec, meaning it seemed heat or even jostling them caused them to lose conductivity. They were the original plug wires... Swapped those, car stopped running for more than a few minutes, then more than a few seconds, now won't start at all. During the diagnosis I found the pickup coil seemed to be weak and I also discovered a wonky fuel delivery system which seemed to be solved with a new pressure regulator. I also dropped in the permanent fuel pressure gauge. So there's no one thing I can point to, with regard to installing or replacing a part, that seems to directly cause the non-running.
as good as a car can be... briefly.