Did this occur on its' own or subsequent to an event?

Probably a bad ground on the headlamp circuit. Check, clean and tighten every ground connection you can find starting at the battery terminal, then the three or four under the same bolt at the RF shock tower, next look for grounds (2) at the headlight area. They will be brown in color.

Good luck!!!

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer