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e class 211 03 plate - Battery problems

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by rogerg, Dec 12, 2012.

  1. rogerg

    rogerg New Member

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    Location:
    uk
    Your Mercedes:
    e500/03/4996
    hi is anyone aware of a fault which causes battery to show that electrical consumers are turned off.this has happened a few times with no problem after car had started,but yesterday car unlocked ok but key wont turn, couldnt get out of park .car eventually started after quick jump start. e class 211 03 plate thanks
     
  2. drmw

    drmw Moderator

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    Location:
    Yorkshire
    Your Mercedes:
    M6 Cab - prior to that, SL63 AMG, A-M V8 Vantage, SL55, SL500 and many more
    consumer electrics offline mean the battery is below a certain voltage - if it then wouldn't start without jumping, then odds on the battery is stuffed
     
  3. kay187

    kay187 Active Member

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    Location:
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    Your Mercedes:
    Mercedes S Class W221 LWB
    I had similar recent issues and its looking like a duff alternator, car in garage so won't know for sure till later.

    I would recommend checking the voltage on the batteries (front/back) both when car is off and on to determine if its your batteries or the alternator.

    Good luck:neutral:
     
  4. DY2

    DY2 Senior Member

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    Location:
    Bexleyheath, Kent
    Your Mercedes:
    W211 2003 E320 Cdi Automatic
    As above - check both batterys with a voltmeter.
    With the engine off, you should have about 12.5v at the terminals
    And with the engine on, you should have a reading around 14.0v
     
  5. Vigilant

    Vigilant Member

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    Location:
    Sutton Coldfield
    Your Mercedes:
    E320 cdi 2003
    I had the same problem on my 2003 e320 cdi. There is a further battery under the air con unit on the left hand side under the bonnet. To replace it is about the same size as a motorbike battery and cost approx £60 from main dealer.

    Hope this helps


    Vig
     
  6. television

    television Always remembered RIP

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    Daventry
    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    The first thing to check on a 211 is to see if the update applies to their car, one also has to remember that on cars that do not get used that much the rear battery should have a good charge once a month. The design had not been thought through that well, every time you stop and start one the current while going to sleep is quite high
     
  7. OP
    rogerg

    rogerg New Member

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    Your Mercedes:
    e500/03/4996
    thanks for ideas everyone ,think it must be pointing to brake battery or alternator as main battery is new .will check voltages cheers
     
  8. whitenemesis

    whitenemesis Senior Member

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    Your Mercedes:
    CLS55 AMG '05
    Everything runs off the main battery (in the boot) the axillary battery in the engine bay is only used if the main battery is low on charge.

    STAR diagnosis should reveal if the alternator isn't charging correctly
     
  9. OP
    rogerg

    rogerg New Member

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    Your Mercedes:
    e500/03/4996
    problems with consumer electrics

    just an update ,changed small battery in bonnet.touch wood all seems well ,working it out that original battery must have been 9 years old!!!!!!!!! thanks all
     

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