I kept the old metal bulb socket, cleaned up the outside of the housing with a small grinder, soldered a ground wire to the outside of the housing, put the ground wire into bundle, then routed the ground wire back to a common grounding block. This grounding block is then attached to the frame of the truck with heavy wire. (one at the front one at the back of the truck)
No more grounding problems, did this on every light in the truck, lights are brighter than they have ever been......no more looking around for ground problems hooked to the body of the truck. It may sound extreme but it solves all the grounding issues........Kieth
http://kieth.smugmug.com/Trucks/66-G...H2c2&lb=1&s=X3
where to buy grounding block:
http://www.electricalconnection.com/...tion/02207.htm