1974 Duster not starting.

Thanks for all the help you guys have provided me with!
I went to look at the wiring today and the Big Red wire that "nm9stheham" mentioned goes into some type of connector which goes into another part of the red wire, well one end was loose and it needed tightened. I did that and scared myself when it fired up.
I was pretty happy it did though.

Any idea how to keep this wire tight? I can get pictures of the connector it goes into if someone could tell me what type it is.
Also now to find a rear bumper D:
Gald you are making progess! Is this connection in the connector leading up the steEring column that goes to the ignition switch? Or a connection that goes through the bulkhead connector in the firewall? Redfish and Trailbeast are referring to the connection in the firewall.

This connection is probably heat annealed by now (softened) and will not hold its tension. You will have to find a new connection and crimp or solder it properly in place. Is it a flat connector or round? Yes, a pix would help.