I have an 04 sierra 2500hd slt that came with stock fog lights which worked fine. As soon as I bought the truck I had installed HIDs in the fog lights and I had them in for over a year with no issues. Recently they had stopped working due to a blown fog light relay. Once I replaced the relay the HIDs would not turn on so I plugged a stock bulb back in to make sure all the wiring was working correctly and it was. I can run a stock bulb with no issues but once I plug in the ballast and bulb to the HID nothing happens. So today I went and bought a new HID kit and still the HIDs don't work but the stock bulb works fine. At this point I'm at a loss and don't know what else to try to get the HIDs working as they did before. Has anyone else had this issue?