I have a 1999 Chevrolet C3500 (Dually) Crew Cab that I bought used about 4 months ago. I have had several issues with the truck since the purchase, most minor. However there is one thing in particular that drives me nuts, and I cannot for the life of me figure out what is wrong. The roof mounted interior lights do not work. I have replaced the headlight switch (since it has the dimmer built into it). I replaced the bulbs in both lights (front and rear) I have checked all of the fuses in both panels and everything is good to go. I even checked out both light sockets with a volt meter. I found that the rear light has 12v coming into it, however the front does not. Has anybody else experienced this issue? If so any thoughts on how to fix it? Any help would be greatly appreciated!