New voltage measurement at right connector A-B with engine hot and running, headlight on, applying middle pressure on gas pedal .

A6: 13.22 V
A8: 12.45 V
A9: 13.04 V
A11: 13.2 V
A13: 13.2 V

B1: surges from 0 to 13.98 V with gas pedal
B3: 7.36 V instead of 10.67 V measured yesterday with engine not running

Ground at A3 and A12 very good.

What do the numbers mean?

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE