This is the spot I use, to get wires thru. The nipple will have to be cut/slit. I use a 3' piece of #12 solid as a fishtape...So i ended up ordering the aux beam 6 gang switch and got it in yesterday.
I started looking at where to punch that wire for the switch through the firewall and wanted to ask where you guys have used.
I have the 3.0 Diesel and the drivers side looks pretty hard to get to without taking out the air filter box/tube and such, but there’s also a lot of stuff there to navigate around finding a wire so i figure i’d just ask before i started poking holes lol.
ETA...I poke the "fishtape" from inside the cabin, as a person can peel insulation away from the firewall to access the nipple easier. Once you do it, the next truck is a cake walk.