1969 Mustang Ignition Wiring Question

Usually it's the 10 ga. (thickest) red one. This wire would connect to the starter solenoid bolt where the battery cable bolts on at the fender via a fuse link wire. The fuse link wire will be a 14 ga with a loop on the bolt end and a fat rubber tube type crimp connector where it hooks to the harness wire.

If you have no power in this wire, suspect the fuse link has blown. It might not 'look' blown, but if you pull on it or bend it it should flop around.

Or just the typical bad connection on that bolt can interrupt the connection.

Some auto parts stores and dealers will sell the fuse link wire by the foot. If blown, you should crimp in a new piece the same length. They need to be crimped, solder can damage them.

Mike