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Um, next PROBLEM! (this time: Charging System)

I rarely speak about the Audi gods.

My car has always seemed like it didn't maintain a high enough voltage,
according to my stock voltmeter.  It usually stays at or just below the
12v mark.  I would be more comfortable if it were around 14v or so,
unloaded by the fan and stuff.

PROBLEM:  Today, at lunch the voltmeter began reading lower and lower. 
When I left it last, it was almost totally rested on the "lowest"
reading (below 8v).

I took a multimeter to the battery with the car off.  It read around
12v.  With the car running, it was more toward 8v.

I guess I'm going to catch a ride home, and bring back my other Audi's
alternator/regulator and battery (just in case).

What's the procedure to diagnose what's wrong?  


Ken  <fingers crossed - please, not the archives! I'm on 14.4kbps,
dialing an outside line at work!>
|------------->Tolerate the freedom of others or lose
| 86 GT <Schrick/Borla/K+N/AZEV/ABT>, 85 4ksq <waiting for turbo>, 94
SL2 |