I had this problem and my battery tested fine. It wuz my OVP relay..

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My Cars
Mercedes CLS
Mercedes C-Class W203 - All time favorite

R.I.P.
Mercedes C-Class - W202 Lemon
Mercedes ML - Warrior
VW Jetta – Worst Car I ever owned - Alot of problems

I know the OVP can have the same symptoms but on a 00 model year? I thought the OVP issues affected the mid-90-series cars?

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car

Turn your climate control to "OFF" and then press and hold EC & REST for 5 seconds to get into diagnostic mode.

Toggle the left hand AUTO button to item #24 and monitor your batt voltage on the display.

Press EC and Rest to get out of diag mode.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)