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W211 220cdi 06 facelift charging

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by SHAMGIT, Sep 10, 2018.

  1. SHAMGIT

    SHAMGIT Senior Member

    Messages:
    70
    Likes Received:
    10
    Joined:
    Mar 2, 2015
    Location:
    york
    Your Mercedes:
    w211 2008 220cdi
    Sons car on dash before startup it says its battery is showing 12.4.
    When driving it stays just below that then after about 10 to 15 minuets it jumps straight up to 14v
    Any ideas please .
    thanks in antisipation.
     
  2. mioba

    mioba Senior Member

    Messages:
    687
    Likes Received:
    29
    Joined:
    Feb 19, 2006
    Location:
    Nottingham
    Your Mercedes:
    W124/1994/E200, W220/2004/S320CDI, W205/2016/C200, W447/2017/3.0 CDI
    The sensor in the alternator or the alternator itself (worn bushes) to hazard a guess
     
  3. onefortheroad

    onefortheroad Senior Member

    Messages:
    589
    Likes Received:
    57
    Joined:
    Dec 8, 2015
    Location:
    uk.
    Your Mercedes:
    E
    14v is normal. Not sure why there would be a delay. Possibly the regulator in the boot ?
     

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