OldCracker29
I've been knocked down drug out and left for dead
I love those old Chevy's. 

If my memory serves me right, those trucks had no relay for the headlamps. The current was all pulled through the headlight switch. I would rewire them with a new switch, and with two relays. One relay for the low beams and a separate relay for the high beams. You mentioned wanting to add winch lights and rear facing lights, go ahead and wire up an aux fuse panel with fuses and relays for each light circuit.
painless wiring had/has a complete wiring harness for 73-87 C/Ks for $575 if you'd rather put a whole new harness in. and if your headlights aren't working I'd look at the switch in the dash or the grounds for the headlights.
Looks to be in good shape for being 30 years old.![]()









