Hi i just purchased a 98 deville and came across a major issue my courtesy lights, cig lighters, glove box light, map lights, trunk and hood lights and visor lights all stopped working at the same time. The fuses are still good for these items, so I'm stumped. These items not only fail to work when entering the car at night, but they can't be manually turned on from the headlight switch either. Has anyone encountered this problem, or can you suggest possible things to check other than taking the car in for an expensive electrical diagnosis? Any help would be greatly appreciated.