[mcconnell45]

On my 2003 there is a main junction block under the dash next to the parking brake. Take off the retaining nut and remove the cover. In the lower left hand corner of the block is a plug with the light green wire you need which is the reverse wire, the wire should go +12V when you put the truck in reverse. Basically this is the same place you would plug your connector in for electric trailer brakes. Also I've been told that there is a reverse wire in the harness for the rearview mirror, to cancel out the selfdimming feature when in reverse, never did check to see if this was true. Like I said this is where it was on my 2003 so Im not sure if it would be the same for you, but I would think it would be. Hope this helps.