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Not hard at all. First start with the load (light bar) look for one with a install kit it will have the correct size wire, fuse and maybe a relay. I like to use a switch with a built in led. If no kit the load is where to start it tells you the wire and fuse size.
google auxiliary light diagrams tons of drawings. The hard part is mounting the sw. your truck may have a place where there is a cover for a sw. that wasn't used that would be my first place to mount one. Need more info. Where do you want to mount the bar? What kind of bulbs? https://www.summitracing.com/search/...ring-harnesses DO NOT get a kit until you know the load of the lights.
Airborne 82nd.
Something to consider. I am helping some other members who, for many reasons, are coming out to a truck with a dead battery in the morning. Trucks and electrical systems get old, insulation cracks, rats gnaw on wires, etc.
When you set your system up, provide a way the aftermarket system can be isolated from the truck for trouble shooting purposes.
Even something as simple as an inline fuse holder would help. Remove the fuse and isolate the system.