I had one of those moment once! I was on my way to the market to get a loaf of bread. Started the car and turn on the head lights, backed out of the driveway and dimmed the lights, into total darkness. I hit hit the dimmer switch again and the brights came back on hit the switch again total darkness. What could be the problem, the only thing I could think of was that the dimmer switch went bad. So the next day I went and picked up a new switch, put it in and 'no help' still no low beams. While I was sitting there thinking what the problem could be, a friend stops by. I explain the problem and he says, "you have only had one low beam for over a month, I bet the other burned out too. Fifteen minutes and two new sealed beams later I had High and Low beams again?