where do the wires from the cabin aux switches end up? Are any pre wired to outside of the cab (past the firewall?).

i was wanting to install a better back up light on an aux switch but don't want to deal with running thru firewall, etc.

 

Bunch of videos on it......

https://m.youtube.com/watch?v=c6dVJQjQyUQ

 

Nothing is pre-wired. There are wires run thru the firewall to the engine bay. You will need to locate the up-fitter wires under the dash just above your left foot area. Then connect whatever switch you are using (#1-#4) to the pass thru wire. Then go to the engine bay, connect a lead to the pass thru wire to your light power.