So the headlights are wired. Not working yet, I suspect it's because I haven't wired the hi/lo floor switch yet. I pulled it out, cleaned it up, not I can't find one of the two screws! Today I had everything out of the dash, gave it a quick sanding and a basic rattle can spray. Looks pretty good (remember, not a show truck). Yesterday the horn relay arrived in the mail, so I mounted it on the firewall. Horn is mounted on the inner fender. Relay has S, B, and H, so I was assuming Switch, Battery, and Horn. I cut the wire going to the horn, connected the link going to the horn to H, connected the other end going into the cab to S, and ran a standalone red wire from my battery positive to the B position. I went into the cab and shorted the horn wire to ground, to close the circuit. I heard the relay click but no sound from the horn. Suspected a ground issue, ran a wire from a screw post on the horn to a ground, still, click but no horn. Attempted reversing the H and S but again, just a click (and just to be sure, horn to B made the horn blare away) so I'm not sure what's going on here.
Also today, finished wiring the headlights. Yesterday I had run the wires from the driver's side through a hole I drilled in the inner fender and the radiator support, on both sides. These holes are about 6 inches down from the top, where I crossed over on the underside of the hood latch lower assembly. I used four clamps on the underside. I really like the end result, the wires are almost completely hidden, or will be once I get the grille back in. Also have to wire the parking lights in the grille once I get it back in there.
While messing with the horn, I was moving the headlight switch, which I have already wired. The area around the head lamps wire on the switch was hot. This doesn't seem good. I might have a short somewhere, I'll need to investigate.