Hey, I have a 2004 superduty with a camper shell on it. I have the brake light wired in and it works fine. The cargo light that came with the shell is battery powered and does not give off enough light. I would like to either wire the existing light to 12v or install a new light to run off the truck's 12v system.
Can I just wire it into one of the wires already at the rear of the truck, or do I need to run a new wire. Any help would be greatly appreciated.
Thanks,

 

If you have a tow package, then one of the wires at the trailer plug should be an aux 12 volt power wire, and you could use that. It should be an orange wire.

If you do not have that system at the rear, you will have to run a wire up front, or you could tie it into the rear tail/license plate lights. You could pull the headlight switch out halfway, and then the cargo light would work.

 

Hi just seen your post. You can wire the light in from your cab cargo light. The black wire which I believe is the same color on all the lights ( as in the two out side ones cargo lights and the center one brake light one) I believe are ground and than the center light has a different color and the two outside have a comon colored wire. Hook up to the out side comon wire for positive and the common colored wire for all three lights as ground Which I think is black. Make a plug there and than run the wires right through canopy to where your lights are. send me your email address and I can send you soom pics of mine that I had on my 2003 F350. This does not work on the new 2008 F350 they have changed things in the wiring and it is computorized.
Can't take the extra load (draw). I hope this helps. RH