headlight levelling (NAC)

[Calvin Krug]

I'm hoping that someone familiar with euro-spec lights can help me 
out here.  I'm helping some friends of mine install some european 
lights on an Alfa Romeo, and we're trying to hook up the headlight 
levellers. Why?  because they're there.
Anyway, I have the switch figured out, it's just a potentiometer with 
three terminals (+,-, and a variable output).  The problem I have now 
is the scematic I have shows two terminals on the headlight motor, 
but there are in fact three.
I've tried all combinations of 12V, ground, and signal from the 
switch, and nothing has worked.  I even opened up the motor assembly 
to see if I could figure out how it is supposed to work, but the 
circuit board in there is just a little beyond my memory of 
electonics.  It's a Bosch unit, so I thought maybe someone here has 
come across a similar setup on a newer Audi, and could shed some 
light, as it were, on the subject.  Thanks.

Calvin Krug
-- 
  I assume full responsibility for my actions, except the ones that
are someone else's fault.