Headlights go down, but not up

Sounds like problems with the gear. Do you know if the original nylong gear has been replaced?

Gear has been replaced by new brass type.
Moves down without any problem.

Brgds
Frode
#1155

You might have a high resistance connection somewhere. Possible bad switch or corroded connector or ground.

Have you checked out the relay? It works the up/down by reversing polarity of the wires to the motor when it throws. Might be stuck inside and causing your issue. The area it's mounted in is known to get water from leaky windshields. At least mine did.

Or maybe one of the feed wires is shorted to ground? It wouldn't be a problem when the wire is negative, the motor would work fine, but when the polarity is reversed...

If nothing was changed prior to the lights not working properly then I would, as suggested above, check the relay first, then that all the connections are good and secure. Next I would check or change the limit switches (swap them?). Good luck!

Mark

possible ground fault (short) in wiring that feeds the micro switch going to the up position

The hot lead going into the headlight motor connects via a ground lug that is NOT grounded using a weird little bakelite standoff that can (and has) cracked and/or soaked up rainwater, allowing partial shorts. The apparent function of the lug-and-stand-off is only to support the little motor wire. In the doors (same motor & gearbox), the motor is grounded so the stand-off is not present but in the headlight system, the motor must be ungrounded to work in both directions.
On any Pantera that comes thru my shop, I disconnect the wire, throw the lug and standoff away, hook the wire from the loom to the motor wire directly using an insulated double-female spade connector and use a tie-wrap around the motor to hold the wire from vibrating. This may not be part of your particular problem but I recommend doing it to avoid future trouble in the area.