ok this is on my friends truck. its an 04 2500. for some reason, the parking lights on the passenger side wont turn on. for the headlight and tail light. we checked the bulbs and they are good. what would cause this? a fuse?

 

Check the fuses under the hood. If you have a plain old lighted circuit tester you can do it without pulling the fuses.

 

Also could be in the light switch, my buddy's 2002 3rd gen gasser had a similar problem, except they wouldn't shut off.

 

thanks guys. we checked it and sure enough it was a fuse. easy fix