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Your alternator is probably shot. A VR regulates the voltage leaving the alternator. In other words, it limits what the voltage that goes to the battery. At idle or at 3000 rpms, it shouldn't be more that 14.3,.5 volts. I agree with the recommendation of pulling the alt. and look at the VR, particularly the brushes. If they are severely worn, perhaps not all the volts are getting to the battery.
What does your battery read with the engine off?
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The "collection"
1983 911 SC Targa (1 of 1430 imported)
1994 MB E320 Coupe (1 of 825 imported)
1992 MB 190E 2.6
2004 Volvo V70 2.5 Turbo (1 of a bazillion imported) 
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