4kq - one dim headlight

[StaticNiche_Quattro]

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I have a '85 4kq.  Three days ago i noticed that the headlights would every=
 now and then go dim real quick then get bright again.  Almost the same as =
when the radiator fan kicks on, only they would go dimmer.  The next day my=
 drivers side headlight hardly works at all.  It is very very dim on high b=
eam and low beam.  The other headlight is fine.  The weird part is that eve=
r since it went dim the display light on the dash that shows if the highbea=
ms are on or not stays partially lit.  Meaning that there is a little bit o=
f power going through that little indication light.  It looks normally lit =
up when the highbeams are on (but the one headlight is still dim)

The next day when i turned on the headlights again, they both worked fine. =
 Three hours later, one is back to being dim.

Does anyone know what the problem might be?  I havent really considered som=
ething being wrong with the bulb because it doesnt seem like a bulb problem=
. Could it be?

Thanks,
  -Dan R.

P=2ES.  The headlights are stock.