Red,
So other lights (tail, parking, brake) work? If so, I would check the fuses for the high and low beams. Is there power coming into the headlight switch itself? How about the hi-lo selector switch on the floor? Be sure to check that you have a good ground too.
I had a bad headlight switch and would routinely lose my headlights. The problem was clearly in the switch. Once the switch was replace, problem solved.
I made my own wiring harness; however, I'm sure someone with experience will give you some advise on the direct replacement harnesses if you choose to go that route.
Good luck,
