i took just drilled out the holes on the inside of the bumper i took some sheat metal that i had laying around, folded it over to have a good anchor since the bumper is all plastic. i fed the wiers through the back hole with some hard rubber tubing and heat shrink to keep everything water tight.

this is an existing ground on the left side of the firewall with the relay of the lights


this is some info that i found on how to get through the firewall
http://en.wikibooks.org/wiki/Jeep_Liberty/Electrical/Firewall_Penetration
for the 12volt + i ran it off the 12volt+ from the daytime running lights

and the swich i put it on the center console
make sure that you make sure that you mape some kind of disconnects so if you ever have to take off your bumper you don't have to rewire your lights each time you take off your bumper.... i learned that one the hard way when a buddy made my clevis mounts for me