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  #1  
Old 08-13-2010, 12:08 PM
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Join Date: Nov 2003
Posts: 31
E-320 dash battery light

2005 E -320 battery light comes on dash, battery ok and the charging is ok. It happens in the morning and the battery light goes out in 10 minutes. Any ideas ?
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  #2  
Old 08-13-2010, 12:46 PM
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Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,621
i think your voltage regulator might be on its last legs
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1989 300ce 129k
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1997 s320 154k (what a ride)

1994 e320 Cabriolet 98k (finally)



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


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  #3  
Old 08-13-2010, 01:09 PM
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Join Date: Sep 2002
Location: New Jersey, U.S.A.
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Have both batteries tested. Also, any shop equipped with SDS can check the battery control module for fault codes. The charging system is probably OK, since the warning message goes away after a few minutes.
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and Germany
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1994 E320 (wrecked)
2001 E320
2005 C240 4Matic Wagon
2000 E320
2000 ML320
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  #4  
Old 08-13-2010, 07:26 PM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
i think that car has two batteries,one small under hood on right side by windshield[said to be for starting]and larger one in trunk.i have replaced a lot of the small batteries.
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European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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  #5  
Old 08-14-2010, 01:14 PM
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Join Date: Jun 1999
Location: Albuquerque, NM USA
Posts: 1,946
One of your batteries needs to be replaced, as it's losing enough voltage overnight to trip the warning. Usually the small one under the hood goes first.
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'07 GL320CDI, '06 SLK350
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