Did they work before, and now have stopped or is this a new conversion to halogens you are working on? I'm not trying to be a wise a** here, but have you confirmed that your low beam bulbs are good? I had a neighbor a few years back that worked all afternoon trying to figure out his lack of low beams, only to find out that he had apparently been running on one light for weeks, and when that one went out he had no lights. He replaced both headlights and all was good again.