I have all the symptoms of a burnt out tail light (Brake and blinker), however i puchased a new bulb but it still does NOT work. I have running lights and the problem only exists on one side (drivers side).. my question is, does the running light bulb affect the brake light? i only changed the brake/blinker light which looks like a single filament bulb. I didn't change the other light (running lights) as it appears to work. Any ideas on what could be happening here?