Best way to hard wire in a light?

[Farmerjohn]

I was wondering if anyone could give me pointers on hard wiring in a rotary light on an 03 250 Im not up on my wiring, never done 2 much, I know the truck doesnt have the plow package, so I want to run the wires through my 3rd brake light, under the headliner down in the dash, Are there any extra leads down there, and should I run it off a relay? I was kinda thinking about getting a set of the new upfitter switches, but dont know how to go about wiring them in either. Like I said im an amateur, so any help would be appreciated, I have done some wiring so im not completly inane.

Thanks

[rednekexprez]

Are you going to wire it to a switch or to your hazzard lights??threw the thrid brake light will work but make sure its at the bottom for less chance of leak and use a little silicon ...
I like to run my wires threw the top of the door seal..I usualy put it under the seal and run it to the front of the door, when I get beside the dash there is a rubber plug I cut and run the wires threw...For wireing yes us a relay..I have used old light switches off
70s style fords you can hook up more than one set of lights and it makes a good 3 position switch..