Check the battery and alternator. One way is to use the diagnostic on the CC unit...
Check this PDF - value for #24 is the battery voltage.
http://mbworld.org/forums/attachments/e-class-w210/220695d1319218810-c-question-mb-w210-ac-diagnostics-flap-test.pdf
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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE
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