74 Dart Wiring diagram

67Dart273 said
So far as the no start problem this is very likely the SEAT BELT interlock. To fix that permanently, locate the "reset" box on the driver side fender apron, and splice the two yellow wires together. This device, when tripped, interrupts the yellow "start" wire which comes from the key and feeds to the starter relay

View attachment 1715811758

View attachment 1715811759

I think you might be on to something there. I was looking for the seat belt interlock but could not find one on the drivers side fender apron. Although, I see wire connections that look like they may go to the box you've shown. If I am missing the reset box entirely is there a way to start without it?

View attachment 1715811762

Edit: let me know if thats not a clear picture