motors will go up but wont go down. is it the isolation relay? relays on each motor? or the motors itself?

 

Hi Rich - I replied to your PM over on NYThirdgen. Check your fuses first to see if one of them is blown. There are 2 separate circuits controlling the headlights.

 

could be all of the above.is it both headlights or just one not going back down?
there are schematics on here somewhere that will help test and figure out which relay is the culprit.I hate that style motor/relay setup and switched it out for the 87+ setup ..less problematic and easier to replace parts.

 

It's both motors

 

The following applies for both the 1982-86 (aka three-wire) headlight actuators and the 1987-92 (aka two-wire) headlight actuators.

If both headlight doors won't close, then look at the following: A blown 20 amp tail light fuse.

The remainder of this answer applies only for the 1982-86 motors: Check for a bad isolation relay or bad connection or ground.

If one headlight motor won't close, then look at the following: A bad isolation relay, bad connection or ground, faulty actuator motor limit switch or bad actuator motor.

If both headlight doors won't open, then look at the following: A blown main fuse link to the headlight switch, a bad isolation relay or a bad connection or ground.

If one headlight door won't open, then look at the following: A bad actuator relay, a blown actuator relay fuseable link, bad connection or ground, faulty actuator motor limit switch or a bad actuator motor.

The isolation relay is on the frame of the car next ot the drivers-side headlight mechanism. The isolation relay controls both headlight actuators. If the motor continuously runs, but doesn't move the headlight bucket up or down, then you have a stripped gear. I sell a repair kit with a brass CNC machined gear as TDS 508210. I also include instructions and a troubleshoot guide (where the recommendations I've listed above came from).

Good luck,

Lon