I decided like Jerry suggested, that relays would just be a common sense and relatively inexpensive upgrade (though possibly not necessary) for the DOT 55/65W H4's and horn. The wiring harness I am using i think has 10-gauge wire for the headlight circuit, I'll have to check, could be 12. It only had one relay (meant for AC) of the new fuse box, so I have already ordered a marine box for additional relays. Jerry's suggestion of self-setting breaker sounds intriguing, so I'll look into that. New dimmer switch, the original headlight switch with built in fuse fell apart in my hands so I have GM 62-66 era switch with repo '37 knob mounted. It will be an upgrade over '37 with a dimmer capability. ignition switch when I got the truck was the ugly aftermarket universal one and didn't even have a key. Purchased a GM 62-66 switch and turned the stainless-steel face nut down and polished to look pretty close to the original look of the ring. The diameter is same as original. New GM octagon keys. I won't need the SOL terminal, or start position, but can gain the upgrade of an ACC position. Appreciate all the help and advice as I string wire! Plan, plan, cut and solder once! Optimism! Larry