Have a 2000 Silverado 3500, 7.4L with a 5 speed manual transmission and the back-up lights just recently quit working. For the past couple of months if the lights didn't come on you could shift out of reverse and then back in and they would come on. Have checked the light bulbs and they are not burnt out and all the contacts look fine. Guessing it is a switch problem, does anyone know where the switch is located that turns on the reverse lights. Any help would be appreciated especially since the truck is due for it's annual state inspection.