I was wondering if anybody has had an issue with the brake lights on a "03" 2500 HD. My Brake light above the rear window works fine but the rear brake lights don't work at all, my turn signals work fine. I checked the fuse inside the cab and its not blown, any suggestions. Thanks Brent

Have you checked for power at the brake lights?? You may have 2 blown bulbs.

After that, you need to backtrack with a test light. Check for power at the rear sockets, then the under bed connector, in cab fuses, underhood fuse......

i have the same problem but its only my drivers side brake lights, (same 2003 2500 hd)

i had this problem on a past 2002 trailblazer and it was a circuit board somewhere in the rear that needed to be replaced...

Sockets do have problems, although not common to these trucks, don't overlook anything. That's why I said to check for power and ground at the bulb (socket).

Old body style truck were bad on sockets, so were the Trailblazer, Malibu and even the vans.