Did you try unplugging the wiring to the driver's door? It's fairly easy and a good way to eliminate it as a possibility in your troubleshooting. Honestly, this is a more common cause of this problem than you would think.

I know I wrote a massive wall of text but this is something I have experience with...

 

You mean taking it out of the system? starting it with those unplugged?

 

Yes, just unplug the driver's door. There is a rubber boot that covers the wires between the door and the body. The body side of that assembly is detachable. Detach it, leave the door open (so you don't crush the connector) and try to start the vehicle.

 

Holy Crap! Another upstate NY'er near me! I've done many midnight trips to Old Forge going thru your town! I've also had to repair wires in that bundle.

 

LOL, yeah I noticed that. Sounds like you've literally driven right past my piece of dirt

 

I really doubt you heard me. That was every Friday night in the summer of both 68 and 69. Well, maybe. I was driving my 67 SS Camaro with Cherry Bombs on it!

 

OK, fair enough - that'd be around when I was born - but our property does border state route 12...