Intermittent Ignition Issue [66 Valiant /6]

jacraest said

To isolate the problem, what cables should I short to isolate the ignition switch as the problem? There’s these wires:
BAT, IGN1, IGN2, ACC, and GRD.
Ground is never plugged into anything and it works regardless. The previous owner had a wire that went between two of the terminals, but I forgot which ones they were. The wire’s gone, but the ignition still works. Maybe make a small ignition on/off switch?

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Well we need to start over. From scratch. Clean slate

Why is it you think you have a switch problem? What is not working, as you were just talking about it running and charging.

GROUND does not need to be used

Power comes in to the switch and BE CAREFUL AS THIS is not fused

ACC is hot both in "run" and ACC" and goes cold in "start"


IGN1 is the dark blue "run" voltage out into the engine bay, and also supplies the voltage regulator IGN terminal. That is ONLY hot in "run." It is cold in ACC or "start"

IGN2 bypasses the ballast resistor for start. It is a SEPARATE switch contact/ circuit from the yellow start wire. Normally brown, it goes to the coil + side of the ballast. It is hot ONLY in the start position

START is normally yellow, is ONLY hot in start and goes out to the start relay, "push on" flag terminal. IF THE neutral start switch on the transmission is working, and the transmission in "P" or "N" the engine should crank with the key

I usually do not recommend "throwing parts" at a problem, but that start relay looks plenty crusty