2007 2500 5.9 with stock headlights. Well my drivers side head light is not working. I tried changing bulbs even by brand no luck. So I checked the plug and it has power to it and no burnt or corroded fittings. So I tried switching passenger to driver bulbs and every bulb works on the passenger side but not the driver. High beam works fine both sides. I've cleaned the plugs and no luck. I've been told of a relay in the dash and behind the battery box but haven't had a chance to look yet. Looking for help yall.