Hey guys..fairly new to the forum, and I'm hoping someone here can help me..2012 Explorer XLT, and I am installing a set of PIAA driving lights, and being an electrician by trade, am fine with all the wiring/ relay, ect., in itself..But NOT being a mechanic (lol) I am trying to figure out the best way to route my switchleg from inside the cab to the engine compartment where I am mounting the relay..I literally only need one wire, as the switch can be grounded right inside the cab as well, and I am feeding it from a switched 12V pwr source in the cab as well. Anyone ever try this, i.e. feeding a wire through the stock wiring bundle that goes through the firewall? Any ideas? I'd rather not drill any holes if I don't have to_pretty tight in there! Thanks for any ideas