Greetings, Mr. Perez! Welcome to the Forums. Hopefully you'll have your question answered authoritatively by someone who knows exactly what you're describing.
I'd guess it's probably the on/off switch for the Univolt 12v
converter system. It would help if you could provide us a photo.
AIR 2053 Current: 2006 Born Free 32 RQ Kodiak Chassis, & 1995 Coachmen B-van
Former Airstreams: 1953 Flying Cloud, 1957 Overlander, 1961 Bambi, 1970 Safari Special, 1978 Argosy Minuet, 1985 325 Moho, 1994 Limited 34' Two-door, 1994 B190 "B-Van"