It depends on how original you want to keep your truck. If staying original is your goal, get a maintenance manual and wire it like it was originally. If you want to improve your truck, use relays. I clearly remember in the 50's if you had a tube type radio and a heater going at the same time the ignition switch got very hot and would quite often fail. Thats why so many Super Deluxe pickups, that is with radio and heater, had aftermarket ignition switches. My first 18 wheeler was a 56 GMC and all the wires including the trailer wires went through the headlight switch. After having several headlight switches go bad in a year I bought 2 Cadilac headlight relays and used one for my cab lights and the other for my trailer lights. That fixed the problem.
