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"BPofMD, how did you get the wires of your fog lights into thru the firewall ??"
N5IBM,
On my 2005 F250SD, Ford has installed 4 wires thru the firewall for us....look in the engine compartment, drivers side, just inside the hood supports. There you will find one red, one white ,one black and ...ummm another color, maybe green, not hooked up to anything.
Under dash, behind the fuse panel is where they terminate inside the truck. I think if you look backwards in this subject you may find the wiring diagram for the upfitter and blank firewall wires. They really helped me.