I have a set of back up lights that have 35 watt lamps in them, Which is no problem for the B/U switch and 14 ga wire that I have on it now. I have a set of 100 watt lamps that I want to put in but I need to run relays for them. Idealy you want the relay as close to the source as possible, So I would like them under the bumper. I got ahold of some pipe and caps, just need to cut some threads on 2 ends. Punch a hole in the middle of the caps and install a gromet. Weld the pipe under the bumper and have the relay's inside the pipe. Then booger on some sealant over the grommet. Any one else running a similar set up?