I picked up a C-30 in Jan and have been working on straightening some things out. So far so good, but does anyone know what this is above the rear view mirror? There’s no wiring to it and it appears to be just a friction knob.
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
Just a little thinking out loud, but have you removed it to see if it has wiring connections on the backside???
Camper Specials had an accessory option for a "camper" wiring harness which may have included a dimmable lighting control switch (???) or even a cab mounted speaker control (???) for radio piped back into the camper compartment.
Since your truck appears to have had the "camper" removed, that may be just a switch that was left to fill a hole in the cab roof when the wiring was removed???
Interested to see what you find by pulling that switch out.
Dan
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)