Re: intermitent starting
The solenoid runs off the small wire off the + side of the battery through 4 wiring harnesses, the ignition switch, the NSS and then through the big ground cable back to the battery. Somewhere in all that you have resistive connections.
I'd probably get a bit of wire and jump between the red and purple wires at the firewall connector under the hood. If that works, then its in the cab.
I'd ask for voltage measurements but no one takes them.
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