I have a 2001 Yellowstone bus on the Spartan chassis. Similar issue on identification of the switch. I am not near my motorhome at the moment, to take a picture for you, but I remember it is on the driver's side window console. It is an unmarked black switch next to the spot light switch.
There is no on/off indicator either.
Google: calterm 40120 toggle for the sample image of the switch .
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