Could it be like on the European Countach ?...in the fuse box, one of the wires (yellow and black if I remember well) which has something to do with an extra (or minus) for the cars which were to be exported to the US should not be connected to any connector. If it is connected, then, for a reason I can't explain, the headlights go up/down/up/down/etc...sometime both together, sometime only one...the most funny one being when one goes up while the other goes down and so on.. Scary when it happens for the first time...but funny once you found out what the problem was

Depends..Emery, where are you from ? (would have helped if you had filled the registration public profile properly )