I'm still looking for a better way to route my wires in to the cab. The firewall is real tight, and I don't see a good place to get in to an existing opening. For now it's going through the wire boot on the passenger side door. The switch for now is just wedged between the front console and dash until I get an afternoon to mount my "Bigfoot lights" switch. I haven't decided if it's going on the dash or on the overhead console. I'll post pictures when I do.
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Not sure if it's because I have different options, but in my '03 XLT there was an empty rubber plug on the drivers side firewall. It's pretty big and is the PERFECT place to bring in wires. If you open the hood and look on the drivers side, toward the center you should see it. Just pull that out from engine compartment, drill a small hole in center and feed your wires through it. Wires will come out high in the drivers side footwell, toward the center console.
From there it's a breeze to put a switch on your center console. I have a couple there and even ran some to the overhead console . This was a bit of a pain but I also don't worry about them getting turned on accidentally up there.
My truck is at the beach right now ( and i'm not) otherwise I'd snap a couple picts. This is by far the best, and easiest place to bring wires in that I've found. Again, you may have different options than me, so your truck may have wires going through it already, but on my truck it was completely empty.