Intermittent Ignition Issue [66 Valiant /6]

If this is a matter of getting it home..........

Open hood, and locate the ballast resistor for the coil. Long white rectangular ceramic, mounted either on driver side firewall or fender apron. Unplug either end. Use whatever you can find to jumper Power to first one wire, then the other from the battery. Whichever end lights up your warning lights on the dash is the end you want to connect to the battery. Now reconnect the ballast wires with that end of the wiring which you determined also jumpered to the battery. So now you have the ballast re-connected, battery clipped / hot wired to one end, and the warning light(s) on the dash should be on.

Now take a screwdriver or even a coin, and MAKING CERTAIN that the gearbox is in neutral, or the shifter in park, jumper across the two exposed terminals on the start relay. Engine should start and run, and you should have a working charging system as evidenced by proper action of the ammeter