snow plow prep. package light hook up?

[AK-47]

I have a 99 siverado thats equipped with a snow plow prep. package (wow, stay that 10 times fast!) It has an aux. switch/button in the cab next to the pass. air bag switch. Its a light or strobe on the roof. Where do I hook a light to. The butten there and I tryed following the wires under the seat and up the back of the cab but where the end? I want to hook up lights in my bed to that switch but I can't find where the wires end!

[GMC HD 4x4]

Its ontop of your head liner

[malfnet1]

In my experience after doing alot of plow light wireing there is a relay located in the drivers side b-piller near the floor. This is where we hooked up lights controlled by the dash switch.

[shaddow]

The wires are coiled up above your headliner right above the drivers seat about where your head is.On a 2000 ecab I had found them there and then I stuck a wire fish in from the 3rd brake light over to the drivers door, taped the wires on and pulled them to the 3rd brake light and added a plug so I could remove my warning light as I wanted.