2003 GUIII ST-L and mine looks like the above, with a different switch in the upper right. It was a blank until I swapped it out for a 3-way switch for my work light. Put the switch there so I could reach through the window to turn on/off the work light easily without having to climb into the cab.
Dimmer switch is on the dash just to the left of the steering column, with the driving lights switch (factory steel bar with IPF 900s) next to it.
You should be able to pop the switch out and check for cabling. If you can't, then remove the lower dash panel below it (one screw on the LHS bottom, 2 screws in each of the pull tabs for bonnet and fuel filler, then lift up from the bottom) and you should be able to look up past the fuse panel into the void behind that switch plate.



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