I have a 2000 chevy s-10 pickup, 4.3 vortec, auto, with automatic headlights "daytime running lights". My headlights seem to go on and off whenever they feel like but my brights will turn on along with everything else, "running lights, tail lights, brake lights, turn signals". Driving down the road today i hit a bump and they turned on, another big bump and off again. Im thinking loose ground but i cant really start tracing wires til tommorow, any ideas on where to start besides the headlights and follow the wiring? any help is appreciated.