I was just informed by a state trooper of a brake light issue I'm having on my way home. When my headlighs are off both my brake lights work fine but when I have my headlights on my drivers side brake light comes on for a second then stops working. At first I thought it was a bad bulb I changed it in front of the trooper but didn't fix the problem. So now I figure its in the wiring I believe it may be a bad ground I obviously have power to the light. Any ideas where I should start when I finally get around to it