The headlight is the gear in the motor, you do not have to replace the
whole motor
just the gear. i understand you can find it on ebay. i found one on
line by a guy making
them for corvettes' (same motor) same gear. Not too bad in price.

My FB had a lot of electrical issues at first. IT turned out to be my
alternator
but it did not test bad when Kragen ran it. So then we took it and had
it tested
IN the car and it showed it was not working.

My electrical engineer ex told me that there are a lot of different
diodes
and when they start to malfunction little things show first. what my
key was
the speedometer needle was bouncing in time with the turn signal. (this
was after it left me stuck in  the rain twice) and he said that is a
specific diode in the alternator.

But try finding the ground. This is very common with FB's. Does it have
an aftermarket stereo or audio system? often that is a problem for
these cars as well. if you need anything else, let me know. I have the
GM repair manuals for the car.

Smiles,
CJ