I sold the ladder rack and the 4 lights, but I welded mounting tabs onto tbe fron bar of my ladder rack and used the moubting bokts that came with it. I grounded the lights to tge rack and grounded the rack to the frame. Then I ran a 12 gauge wire from the distribution block on the fire wall, through a heavy duty inline fuse, through the fire wall, into a 50 amp toggle switch, out of the switch, out the fire wall, under the truck, up between the bed and cab, up the ladder rack, and to the lights. never blew a fuse and very bright. I didnt need a relay.