My 1790 has 2 near the test panel for the water/battery/tanks. One is a master switch for the light nearest the door. Makes it easier if you have to turn it on at night instead of reaching up to the ceiling. The other turns on the LED strip lights mounted on the awning, and most likely as old_engineer said, the third is most likely for an exterior wall mounted light. It looks like the 2101FBS has alight mounted to the left of the door above the window? If so, that will be the third one.
That is, if you are referring to the matte black rocker panel switches.
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2018 Winnebago Winnie 2401RG
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