74 Dart Wiring Help Needed

Why not start over?
You want a wire harness because you think that "switches" caused yours to fail? I have seen wiper motors sieze and cause a meltdown in that section of the harness. I've had a headlight switch cause a fusible link to melt. I have made my own wiring harnesses using new wire and old plug connectors. I am not that skilled with electrical work so it took a few days. For a plug and play harness, try Evans Wiring.They are one vendor that does good work. Ron Francis is another.
Best of luck.