Right front running light on my 2000 gmc yukon does not light. i see the same problem on many gmc and chevrolet trucks and suvs. the problem may appear in a high percentage of these vehicles. when i remove the housing for the light it usually holds water from rain or car washes. there is a hole in the housing which looks like it was poked with a screwdriver. a new bulb will only last for 100 miles or so, then it will short out. *tr