have you replaced the bulbs before?? if you have not replaced them before then that is what i would do first. if you still have the problem then start trying to figure out a wiring issue. but making sure that your bulbs are good is the first issue to solve.
Hey guys, I just saw this thread. I was having the same problem and about 20 minutes ago I replaced the bulbs, but hitting the high beam switch still cuts out all light...low beam is fine. Any ideas what else to check?