I have an '88 Eurocoach with similar switches. Rich's hallway switches and mine are the same: In hallway facing bedroom, on left, first is overhead light in hall, second is for valance lighting in bedroom. Both operate off 12VDC from battery or converter. The switch inside the bathroom on right hand side of toilet is for the overhead light in bathroom, again 12VDC off batt's or converter. The brown switch in the closet below the light on left hand when facing closet is for the artic package in mine. The arctic package is 120VAC, I think, and operates heaters in the holding tanks to keep them from freezing in winter. Nothing appears to happen when you switch it on other than the green lite in the switch itself coming on.