Switch the two bulbs side-to-side to see if the bulb or the socket is the problem.
If the bulb is dim, there is a bad ground and both the high and low beams will be dim. On the dim setting, the high beam indicator on the dash will be on dim too. If the bulb is out completely, suspect a problem with the feed wire.
Wednesday, February 17th, 2010 AT 4:29 AM