First thing to know is that it is pretty simple. Buy a wiring harness. I recommend one with prewired fuse panel. I like the ATO fuse panel. From there it's follow the instructions and use the original wiring diagram also, so you learn what you are doing. I don't know your expertise or experience, but don't at all be intimidated by wiring.
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Read the 12V conversion in our "TIP" section. You will need a ballast resistor.
There are three main bundles to route and tie. Care should be taken to make the route and bundle look good. If there are inner fender terminal boards, I would eliminate those.
There are VERY few wires on an old truck.
The defroster and heater are mechanical items for you to sort out/rebuild/buy. The wiring is just the blower motor.
The wipers are all mechanical if they are vacuum. Heater and wiper questions are for another post.
The three main bundles are:
1. Front lighting/gauge senders/horn
2. Rear lighting
3. Dash/switches/gauge/cab
There will be a few "ignition/charging" wires. Some may not be part of a harness.
Take pictures of all wiring as it exists. All the routing, inside and out. Under chassis and under hood. If this is your first time, those pics will help you as you go. save all the connectors and wiring accessories for ref.
Decide where you want the fuse panel. Firewall, inside cab, upper left is a good place if possible. Sort out/lay out the harness with a few tie wraps as a general layout.
When you get that far, you will have more questions or if stumped, Happy to help.
In general: Everything has a fuse or fusible link. Everything has a switch. If you have a turn signal switch, follow those instructions.
I would not worry about trailer wiring. I would "tap in" after finished with all wiring.
Sooner or later we will need to know your plans/upgrades, if other than 12V conversion.
1. Generator or alternator
2. Foot start or other
3. Ammeter or voltmeter
4. Turn signal switch or not (dual filament bulbs)
5. Pertronix or other than stock distributor.
6. Other upgrade accessories from original.
