Your wire to the right brake light is making contact with the blinker. Usually in a GM the wires will rub under the box and short out there. Check the plug-ins on the rear of the frame for corrosion first, that could be the problem. If everything is good there then you will have to unwrap the harness to the right side of the truck and start looking for bare spots or cracks in the insulation. Just tape them up and you'll beokay. Hope this helps.
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