Originally Posted by Heywodja
Does any one have suggestions on running the wires through the firewall. I am installing a set of rigid d2 dually's, I was hoping to use an existing penetration on the firewall but I can't seem to find where to run the wires through.
I'm not sure if it's the same on the '08, but the easiest access on my '12 was by prying off the side panel on the dash (one driver side, one passenger side...open door and you'll see it). There's a foam-filled hole about the size of a quarter. Inside the engine bay there's usually a rubber plug that you gotta pull, unless someone's already done it.
Straighten out a coathanger, tape your wires to it and fish em through...