[s-cars] O Audi Gods part II

[Bob Rossato]

> I conjecture the following: Red is battery (fused), brown is
> ground/chassis, yellow is likely the low beam "on" signal connecting to
> an internal relay), and black goes to ignition switched battery, as
> someone previously noted.  I think the ignition switched battery is
> disabled when motor starting is in process.
>
> So, do ya feel lucky?  If so, hook it up.  You could start with yellow
> to battery and brown to chassis and listen for a relay click, but it may
> just be a semiconductor switch rather than a true relay.  Then do red
> and yellow to battery, and brown to ground.  If nothing happens, add
> black to the battery circuit.  Use a 1 kilohm resistor in series with
> the black to be safe.

I sent the same info to Nick off list earlier, with the exception of the 1
kohm resistor on the black wire.  At first I was thinking along the same
lines that the black wire was intended to allow the lights to only operate
with the ignition on (black is typically wired through the ignition switch)
but that doesn't seem to make sense as the yellow trigger wire from the
headlight switch already goes through the ignition switch and is also wired
through the X-Cutout relay so that it disengages during the starting
process.  So I'm a little stumped on the purpose of the black wire as it
would seem redundant to the yellow wire. Obviously I'm missing something.
But I agree that red is the main power for the ballast, yellow is the
trigger, and brown is the ground for the circuit so start with those three
first and see what happens.

Bob