Seems to me it was a 1965 or 66 model. Here are some wiring diagrams so you can see what i mean.

Chevrolet Silverado Headlight Wiring Diagram Ricks Free
Basic headlight wiring diagram. I found it hard to believe but it was true. This diagram was designed for 12 volt systems but can also be used for 6 volt systems. 1measure the lenght of the wire you need from the stock wiring going to the left to right if your battery is in the right then your wiring should start in right headlamp going to left. For example 14 gauge wire will become 12 gauge 10 gauge will be 8 gauge etc. A wiring diagram is a streamlined conventional pictorial representation of an electrical circuit. Headlight switch relief relay wiring fuel pump relay wiring red to a good chassis ground.
Its fully insulated and contains up to 7 wires. If used for 6 volt make all the wires heavier by 2 gauges. Its set up for a basic system. Hot rod wiring diagram please note. Collection of headlight socket wiring diagram. Basic relay wiring brake switch relay wiring pink red black orange.
After you have all the things and tools you will use now lets make a headlight wiring relay kit. It reveals the parts of the circuit as streamlined shapes and the power and signal links between the tools. I had to cut into the wiring bundle and separate each wire and test it till i finally found the fault. Basic automotive relay operation and simple. Just make sure the gauge is ok for what you want. So todays wiring is pretty good.
The wiring diagram below will get you good bright lights without overloading the switches and wiring. This setup will activate a buzzer or a chime when the headlights are on when the ignition is still turned on. Relay 5 pin wiring diagram duration. First study the 3 diagrams that you will use as your guide on how you want to built your wiring. 86 87a 87 87 30 85 86 87 87a 30 85. Hopefully those looking for practical information on electrical circuits and wiring led components found this guide first.
Its cheap by the foot and protects the wiring from any cuts wear etc. All the wires were one color white. Ok so lets get to wiring. Its likely though youve already read the wikipedia page about series and parallel circuits here maybe a few other google search results on the subject and are still unclear or wanting more specific information as it pertains to leds. This video is a detailed walkthrough of the american autowire headlight enhancement relay kit.