I checked today and your explanation was spot on. The unmarked switch powers the after market Modem and Cellular booster connected to the Winegard 360 antenna.
I am the second owner and trying to get familiar with the RV. I have not had it out at night as yet but looking under the steps, I don't see any light.
I have a 2022 Mallard 210RB. in the entryway there are three unlabeled switches. One for inside lights, one for the outside awning LED and one that I can't figure out. Any idea what this third switch might do?
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