I have a 84 trans am and some times the headlights will come up and sometimes they wont. Both work or dont work at the same time so im thinking it is probably in the circuit or swith that controls them both. You guys have any ideas or experienced this before.

 

I'd suspect the isolation relay, the headlight switch, or a bad connection somewhere between the two.
2vmodular posted a wiring diagram in this thread.

-Jeff

 

Hmm there was a piece inside the unit which my dad put into a microwave. I cant remember the type of compound but when heated it took its original shape and lo and behold the lights worked again. This was a fiero but I am very sure they use the same set up. I will try to get deatiols from him if you are still having issues you can evaluate his steps.

 

Check the drive motor to see if it is running. On the top there is a **** that should spin when the lights go up or down. If the motors are running then the gears are the problem. Two things can be wrong, (1) the sprocket is worn or, (2) the nylon bushings are shattered. Here is a picture of the sprocket with shattered bushings:

<img src="http://home.earthlink.net/~ozvresto/GTA/images/clean%20gear_big.jpg">


To repair mine I used metal bushings as shown on the picture below. The only drawback in using metal is that they do not absorb the shock when the door opens and it may wear the sprocket which leads to a bigger problem. So instead use some nylon bushings that can be purchased at the hardware store.

<img src="http://home.earthlink.net/~ozvresto/GTA/images/insbushng_big.jpg">

Hope that helps some,
-Ozzy