This is happening on my 2001 Ford F250 right now.

The clip on the plug that holds the electrical connection nice and
snug is broken.  If I push the bulb into the socket nice and tight,
the buld burns bright but when i let go, the bulb dims again.  In my
case, I need a new plug... Maybe you do too.

Joe

On 26-Oct-09, at 3:11 PM, Jack R. wrote:

My 84 Westy, original wiring, with H4 bulbs (normal 55w range), has
developed a "dim" drivers side light on low beam.

Not that noticeable, but obviously dimmer.  The high-beam seems equal.

Last time I changed bulbs, I used Di-Electric grease and the contacts
appeared clean.

Any suggestions as to why the one bulb would be dimmer than the other?

Thanks,

Jack R.

84 Westy Wolfie

Bloomfield Hills, MI