my 1999 GMC Sierra 2500. the brake lights have stopped working. The third brake light still does work tho. the only other problem with the lights is that when i turn the hazards on the front left one doesnt work. I dont know if this could be related or not. Anyone that can help me figure this out thank you very much ---------- Post added at 03:05 PM ---------- Previous post was at 02:42 PM ---------- i have checked all the fuses, none are blown. all the bulbs are good and i replaced both of the circuit boards for the rear lights. still no brake lights.