[urq] Voltage Regulator Module?

Thatcher Hubbard thatcher.hubbard at gmail.com
Wed Jul 22 15:14:44 PDT 2009

Thanks Steve, the little red light with the battery outline on it does come
on when the ignition is on but I've not yet started the engine.

When I was complaining about the light not coming on, I more meant that I
was under the impression that the light came on if the alternator output
went under a certain voltage.

Anyone know about the 32mm vs. 28mm slip ring question?

On Mon, Jul 20, 2009 at 3:15 PM, urq <urq at pacbell.net> wrote:

> If you are saying that the charging warning light never comes on, even when
> starting the car, you may not need a new alternator.  Check to see if the
> bulb is burned out.  The current for the alternator field is supplied
> through the warning light.  Turn the ignition switch to on but don't start
> the engine.  Measure the voltage at the field pin on the alternator (D+,
> Blue).  If you don't see a voltage above ground at this point the
> alternator
> field is not being energized and that is why the battery is not being
> charged.
> If the Alternator warning light comes on when the ignition is on and the
> engine is not running, then the bulb is likely connected to the field wire
> on the alternator.
> Steve Buchholz
> -----Original Message-----
> My alternator is providing 12.3 volts when the car is running, which is a
> pretty clear explanation of why my battery keeps going dead.
> I notice that replacements are listed with both a 28mm and 32mm slip ring.
> Does anybody know what stock on an '83 US-spec quattro should be?
> My alternator light never came on, which isn't a surprise, I've been having
> dash-light issues since day 1.  At least it's an easy fix.
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