2004' Aux switches

There are none. Those are electronic. They are like keys on a keyboard. For other options, they would install whatever output device, install the switch and then program the body controller to accept the command digitally from the switch.

 

Right, you would remove the blank, and install the rocker switch which would engage the digital buttons on the circuit board of the switch pack. The LED indicator and back light for park lights LED will also be missing and need to be installed too. Right now, the body controller is programmed with those locations as unused. For fog lights, as an example, yes, you would purchase the fog light plastic rocker switch and pop it in. Then you have to program and enable the fog light feature in the body controller and the switch location, the wiring has to be physically installed and wired in to the correct outputs pins of the body controller. If you have existing wiring there, you would have to confirm they are actually for fog lights and pinned correctly all the way back to the body controller. Generally, if the truck wasn't ordered with them, the wiring won't be complete. But you might get lucky and the wiring is physically there. Then all you need is the rocker switch, LEDs, programming enabled and a set of fog lights.

For other accessories, such as suspension dump, you would need the rocker, programming, air solenoid pack, wiring to the body controller, dump style leveling valve and corresponding air lines. So depending on what you want, it isn't always as easy as simply installing the rocker switch and programming it.