OR, the headlight may not be grounded correctly. I once removed the bolt that holds a plastic piece with a metal tab where it bolted to the body and a bunch of wires coming out of it. I couldn't figure out why one headlight was really really dim while the other was just fine. Turns out I forgot to put that plastic piece back on and that it had a metal tab because that was a gound. h:

Did you do anything right before you noticed it was doing what it is?

hih