Every once in a while my headlights shut off. All parking lights stay on, but headlight will turn off then flicker back on. Also, I don't know if its related, but the passenger light is a bit more dim. I did take the ground wire out and sand everything down. The screw was a little rusty but everything else was sanded down. It got better and has only done it once for like 3 secs this time. Is the screw corrosion effecting it?