Hey there I am reviving this thread.
I also have a 73 dart sport witch some interesting ignition problems. I have a thread on here titled “wont start unless door is open” and I explained how the car would only start if the the driver side door was open. I tracked down a few shorts and replaced some parts. Fixed a few things except the ignition.
some time has passed and I had it running and idling a few days ago. I can’t remember what I did or moved, expect for grounding the seatbelt to the body of the car. Now the car only starts when the starter is engaged. The second I release the key from the starter, the car dies. I just took my ignition module to napa and they said it works after testing it. I am very confident I don’t have the seatbelt interlock. Also the car has the starter solenoid which I am very suspicious of.
View attachment 1715896123