What would make my rear right taillight not work? on 2004 Chevrolet Avalanche 1500

My rear right taillight is not working and I have already changed the bulb everything else is working.

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2 answers 2 comments
A blown fuse. A bad brake switch.
it's not a fuse. but it's could be a bad brake switch.
I HAD A SIMILIAR PROBLEM IN MY 87 BUICK GRAND NATIONAL. EVERYTHING WORKED BUT MY BRAKE LIGHTS WOULDNT WORK. IT SO HAPPENED THAT I GOT A SERIOUS SOUND SYSTEM PUT IN AND WHEN THEY GROUNDED IT OUT TO THE BODY THEY ACCIDENTLY WENT THROUGH A WIRE. IF YOU HAVE A SOUND SYSTEM IN IT MAYBE CHECK THAT.
well the person that had it before had a system in it and they took it out but will check.