[s-cars] O Audi Gods part II

[Kirby Smith]

Well, since we don't have a schematic, we will have to depend on logic,
followed by experimentation (easy to say as the lamps aren't mine :). 
What properties does the circuit have to perform? [retorical question] 
The circuit has to power the lights, allow remote turn on, but also
disable them during motor starting (through the load reduction relay or
ignition switch circuit).

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.

Usual weasel disclaimers apply.

kirby


NDoshi at aol.com wrote:
> 
> Thanks to all who shed light on my Xenon hook up project. Here is the latest.
> Like I said before, there are 4 wires in the harness going to the ballast box
> (Red, Black, Yellow and Brown) The Red and Brown are a larger size. Testing
> between all four, the only reading is 1200 ohms between the Yellow and Brown
> with all other combinations reading in the megohms. This leads me to believe
> that the Yellow wire is the "on" which corresponds to the low beam color code on
> the US spec harness. Now if I can confirm what Red and Black are for sure.
> 
> Regards,
> 
> Nick
> 1995.5 S6  50% of the way to Xenon low beams
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