headlight switch?? Do the lights all shut off when you shut the truck off? If so, if the truck is off can you turn the lights on and off with the switch?
If the light sensor was bad, and parking brake is on when you start the truck the lights would be off and then when you release the brake they would come on.
Knowledge has no value unless its shared with others.
Exploration Machine- 02' CC V8 swap. 300K+
Portable Roller Coaster- 07' MKV VW GTI
Its another Jeep- 98 TJ