Intermittent Ignition Issue [66 Valiant /6]

jacraest said

I think it’s a switch issue because randomly, the car will go to the “start” position of the ignition and not crank. no click. no noise. do not pass go. Happens at the worst of times too. The first time it happened I took the ignition out of the keyhole, wiggled it around, and it started working again. Last night when it happened I let the car sit overnight (after being towed) and all of a sudden it started cranking again.

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Take the switch out and use your multimeter set to resistance. Clip the probes together. Whatever that reading is,thats you meter's zero resistance. Clip one probe on the Bat terminal. The other on another terminal. Test in all key positions. Do the same for each terminal.
With the key in start, the Bat terminal should connect with minimal resistance to the ST as well the I2 terminals.
Jiggle key to make sure its consistant.
With key in run, Bat terminal should connect with minimal resistance to the IGN1 and ACC terminals.