Originally Posted by PavementPounder
The OEM switch will fail. Known problem on XJ's. The bulb inside the switch burns too hot and the metal inside the switch warps, thus failing to make contact. (Per Jesus .)
Changing out the bulb to that of a different color (like the Rear Window/Mirror Defrost) apparently works.
Never had this problem on any of mine; switch was possibly updated since Jesus was complaining about it. I talked about this with him before.