The gear that drives the raise/lowers the headlight is made of pastic
and will 'strip' over time. You can either replace the whole
motor/gear assembly, take it apart and turn the gear 180 degress(to the
side that is not used) or replace with a metal gear. There is a web
site that offers brass replacement gears. Don't have it handy, just
google around for F-Body repair headlight motor.
It's a common problem due to that pastic gear.
Before you go replacing anything take a really good look at it. and have
someone sit in the car and turn the lights on and off. There is a good
chance that there is something getting in the way not allowing the light to
move. This happened to my buddy and it wound up being a washer that was
getting in the way of things. Although his was stuck up solid but it would
be worth. Taking a look.
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