Back up and dome light on 2005 Chevrolet Silverado 2500 HD

My back up and dome lights do not work. The bulbs are good. How can I trace the wiring? Or, should it go to the dealer?

Asked by for the 2005 Chevrolet Silverado 2500 HD
The fuse panel next to the door has three 15amp fuse at the bottom right one is burnt out. I found it on mine . hope this helps
THANKS THAT WAS THE PROBLEM
Thanks that was my problem also....my dome light and b/u lights have been off for couple years..
that was my problem also thanks, i even replace the switch and still no luke
2 answers 3 comments
You will need a wiring diagram, a voltmeter, and the ability to interpret the diagram and diagnose the circuit. If this is over your head, you should consider taking it to a shop. Try our directory if you don't know where to take it: http://repairpal.com/directory