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ML63 Charging Voltage suspect?

Discussion in 'AMG' started by Nawaz SouthSudan, Jul 5, 2018.

  1. Nawaz SouthSudan

    Nawaz SouthSudan New Member

    Likes Received:
    Jul 5, 2018
    Your Mercedes:
    ML63 2007 6.2 AMG
    I bought an ML63 6.2V8 in November 2017. The starter "felt lazy" so took it up the motorway - 200miles later - no improvement. The charging voltage after 200 motorway miles was an indicated 12.4V on the dashbord.

    So changed the battery for a new MB from dealer in March 2018. No improvement.

    So changed the alternator - new MB from dealer in June 2018. Charging improved to 13.4V to 13.7V on the dashboard. When measured with a Fluke, it is over 14V.

    2 things:

    1) Starter still "dips speed" on cranking-turnover - even with a warm engine before ignition...

    2) Very puzzling: when you "blip the throttle" - voltage goes down before increasing? How?

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