Dim Headlights

When troubleshooting electrical problems, the first thing to do is verify there is a good ground. Bad grounds cause all kinds of bad electrical behavior.

Under the instrument panel, just to the left of the speedometer, there is a big bundle of black wires that terminate to a small stud. Pull that nut and wire brush the contact surfaces.

Also, pull the connector off the headlight bulb and be sure there is good contact there. The act of pulling them and reconnecting several times will burnish the contacts.

Do you have a voltage tester? Check the voltage at the bulb connector. It should be close to the voltage you read across the battery terminals.

The headlight door motor is not exactly speedy when functioning properly. This observation may be a red herring.

Also, check the fuse panel and make sure the fuses are making good contact. Probably should to that first since it is easy to get to.

It is worth mentioning that you should also check the voltage of the car's system with the engine running.

It should be 13.85 volts with at the battery terminal when running.

on 6915 i had one side dim.When i removed the headlight i found the connector full of paint,so i decided to replace the wire connectors,what i found was the ground wire[black]and the highbeam wire[gray/black]had been switched in the connector. Check out the wiring diagrams over at the Panteraplace.

The headlight motor is a std DC type, so if all else fails (grounds, contact cleaning etc), its fairly easy to replace the motor brushes and tidy up the commutator bars with an X-Acto knife. The drive motor drops out the bottom behind the radiator when three small 10mm bolts are removed. It's the identical motor as is used to raise/lower the windows.
The car as-new had plastic bushings on the ends of the headlight bar, and if any bodywork was ever done, expect the bushings to be gone, which increases friction in the system. The bar was put in before the fenders were spot-welded in place, so it cannot be removed (in one piece, anyway), but with some fiddling, new bushings can be installed anyway. Hope this helps.

try the ground it is usualy the culprit.