hi everyone i just bought an 1999 audi A6 2.8 and i having trouble with the headlights and fog lights, the problem is the daytime driving light comes on but the nightime driving light doesnt turn on, and the fog light i tested the bulbs they works fine, but they wont come on as well, so i need some help from the experts in the forum to help me out, could it be the light switch burn out or the ballast of the light, and i am not sure if my car suppose to come with xenon light, if so definately my night time driving light has problem, cuz all i can see is dim yellow light project from the headlight.