How do you test a headlight switch for a 1989 200TQ Sedan?

[Dave Haupt]

My headlights just died one day, not so long ago. 
Unfortunately, it was while on a 650 mile drive from
my old home to the temporary "corporate housing" which
I will inhabit for some months, while the Bentley is
held hostage in storage possibly hundreds of miles
away.

I replaced the headlight switch, since that's been the
culprit in the past, but the headlights still don't
work!  So I took a DVM to the old headlight switch,
and have not found any contacts that get made when the
switch is moved to the "headlights on" position.  Can
the old switch and the new switch both be bad?

The high/low for each side are separately fused - and
the four fuses are all good.

More detailed description of symptom:

Headlight switch to first position, and the parking
lights come on as normal.  Move headlight switch to
second position, and I don't get any headlights, and
the "bulb dead" alarm goes off.  Whether the headlight
switch is "on" "park" or "off", if I pull back on the
stalk for highbeams, I get the blue indicator on the
dashboard that the highbeams are on, but they don't
actually come on.  This is the identical set of
symptoms as I had last time the headlight switch
failed.

What would be ideal is if someone could tell me which
pins on the switch ran to 12V, and which ones fed the
low, and which ones fed the highbeams.  They all have
labels, little letters, maybe they're shown in the
Bentley.

The vehicle is a 1989 200 Turbo Quattro Sedan, very
early version, built about June/July 1988 with the
single knock sensor MC 10V engine.

My night time driving is dependent on some clever BTDT
from this educated group!

Kindly,

Dave H
Somewhere between Santa Rosa, California and
Beaverton, Oregon


		
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