Take a jump over to Smokinvette.com and click on the C4 technical section and you will see the thread with detailed instructions on this. Good luck!
I don't own a C4, however there are detailed directions on how to do this at Smokinvette.com and with pics too! So it is really laid out to make it an easy job. Are you changing the cheap plastic gears? A ton of C4 owners have and put in the brass gears. Good luck.
Go to http://www.corvettefever.com/howto/33098/index.html. This gives full description for rebuilding C4 headlght drives.
The plastic gears in the headlight motors are weak. I had the same problem with my 1984 Corvette. You can get a new motor, but it's much cheaper to get new gears. Check out the C4 section at CorvetteForum.com for a how-to on replacing it.
On the C4 the motor is actually attached to the bracket that holds the headlight assembly. There are about six 10mm bolts that hold it on and one at the end of the drive shaft. That shaft bolt is like a 5/8s and is difficult to reach. I removed the entire assembly from the hood which made it easier to get at the bolts. It's not a difficult task to remove the headlight motor. 88 and newer C4s have a different motor, but the removal process is similar. The C5 is similar as well. Hope this helps.
there are four bolts then the top will pick straight off
Taking the seat out of the car first is going to make it 100 times easier. From there it is pretty straight forward as you will see the bolts that need to come off to remove the motor! Feel free to jump on over to Smokinvette.com and get some more detailed pics of the process!
I had the same problem, and I I looked and posted on the corvette forum without much luck... however I Just fixed this same issue on my 1990... What I did to fix was to unbolt (not remove) the electric motor on the side I just replaced the bushings in and turn the motor 180 degrees in place, then bolted it back up.. Now the headlights are working correctly.
"Corvette Mike" over at Smokinvette.com knows just about everything you can imagine about C4 Corvettes! Good luck!
Once again, seeing that I don't know a whole lot on the C4 Corvette I would ask this question in the C4 technical section on Smokinvette.com and get a dead on answer! Good luck!
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For this one I would go to Smokinvette.com and to the C4 general section and type in the search bar what you need. I believe it was only a few days ago that this was being discussed. Good luck!
Jump on over to Smokinvette.com and there are diagrams for every C4 in the C4 section. Just ask "corvetteDon" he has a ton of information on C4's! Good luck!