My whole electrical system is in need of an overhaul. I've gone over it and while the wiring routing and overall schematic is all roughly stock, there are any number of splices, wire nuts, twisted together wires with electrical tape and other nonsense that shouldn't be there. The good news (HA!) is they leave lots of places to attach a multimeter.
I cleaned up the rats nest areas some, stripped out randomly added circuits for things that are no longer there, fixed some twisted splices with actual butt connector splices; recovered with electrical tape several spots with damaged or removed insulation. But it really needs to just be redone when I get a chance. I have parts in a shopping cart online to do a proper electrical harness rebuild, but I want to get a greater understanding of this new to me truck before I dive in to that.
I got all the lights working again, and the charging circuit and gauges functioning correctly, but other bit of wiring cleanup have had to happen as I have issues.
I did not get a chance to check wires around the ignition switch. These dashes are awfully difficult to get under and look up at easily. I'll check through that this weekend.
I'm still in the expanding my knowledge about this truck (and indeed engine repair in general) phase.
Cheers,
JFS III