Car wont start unless door is open
The electrical path "normally" for the start relay coil should be completely independent of any other circuit, here is how it works in 73:
The start signal for the relay comes off the "start" contact on the ignition switch--a dedicated, separate contact. It goes nowhere else. It feeds a yellow wire which goes directly through the bulkhead connector and to one of the two "flag" push on terminals on the start relay. Through the relay coil and out the second "flag" teminal, from that terminal a wire goes down the firewall, over the transmission, and connects to the center pin on the neutral safety switch, which is grounded in park or neutral.
NO PART of this circuit is (originally) interconnected with any other circuit in the car
In my mind the problem must be a pinched / damaged harness, or wires burned or melted from a short, or someone modified the wiring or tried to add a security system.
Once again if this is some odd late year 73 which has the seat belt interlock, even that goes to no other part of the wiring. The reset box simply opens the yellow "start" wire
when we got the car, we noticed that this connector had been fried. Also the owner before us was mr.jenkyPants so a lot of things are unplugged but seem to have no where to go.The electrical path "normally" for the start relay coil should be completely independent of any other circuit, here is how it works in 73:
The start signal for the relay comes off the "start" contact on the ignition switch--a dedicated, separate contact. It goes nowhere else. It feeds a yellow wire which goes directly through the bulkhead connector and to one of the two "flag" push on terminals on the start relay. Through the relay coil and out the second "flag" teminal, from that terminal a wire goes down the firewall, over the transmission, and connects to the center pin on the neutral safety switch, which is grounded in park or neutral.
NO PART of this circuit is (originally) interconnected with any other circuit in the car
In my mind the problem must be a pinched / damaged harness, or wires burned or melted from a short, or someone modified the wiring or tried to add a security system.
Once again if this is some odd late year 73 which has the seat belt interlock, even that goes to no other part of the wiring. The reset box simply opens the yellow "start" wire