Very easy fix takes about 1 hour if you can remove your extra tire and get under the truck and Parts from the dealer were about $65.00 and $25 IF you...
Welcome to the club! I would do what RayVoy recommended and check the switch contacts first. That would be your easiest and least expensive starting...
1974 Triumph Spitfire 1500
2003 Avalanche Z71, No Cladding
2003 Sierra 3500HD Duramax
Signature
2001 Silverado Reg. Cab Not-So-Base -- SOLD
2003 Avalanche Z71. No Cladding. Check out my Mod thread.
1974 Triumph Spitfire 1500 - Work in Progress
2003 Sierra 3500 Duramax. The Newer, Better Work Truck