On your picture #2 of the ignition switch. I see that it uses spade type connectors inside the connector plug. I mentioned earlier about replacing the resistance wire on a truck I had that was cutting out on the road. The fix for that (after replacing the resisitance wire and finding that didn't fix it) was removing the spade type connector from the coil and squeezing it with a pair of pliers to tighten it up. It had somehow got loose enough that it would lose contact and kill the engine. The female spade connectors will pull out of the connector body if you release them with a pick. There's a springy bit that engages the connector body that you have to push back to unclip. Could be the vibration from the running engine makes the wire lose connection, since you mentioned an unstable voltage at the coil.
BTW, I hope you had your meter set to DC volts and NOT ohms. Using a meter set to ohms on a hot connection is a good way to kill the meter.
Last edited by klhansen; 09/26/2019 7:03 PM.
