Originally Posted by bird 60
I had the ignition switch replaced nearly 10 years ago with a new yellow wire, & a fuse before the starter solenoid. I've got the Pertronix distributor, also an Alternator but the Coil looks standard.
Again, I'm with John. Solid state components need full voltage.
Chris, I'm not suggesting your yellow wire is bad, I'm suggesting it has somehow worked itself loose. I believe a bad connection, probably at the headlight switch, is the reason your engine shuts off when you turn the lights on. The solenoid fuse in the starting circuit is not stock but ok. Ford did not fuse your ignition circuit. Exactly where in the circuit is this fuse? - Dave