C220 CDI Battery\Altenator warning light

Discussion in 'Engine' started by jechydda, Dec 19, 2008.

  1. jechydda

    jechydda New Member

    Dec 18, 2008
    got the message appering the other day whilst driving. charged battery though it was pretty full.

    done a reset on the error message when ignition key removed to cler message, no malfunctions when restarted but still appeared whilst driving.

    got a garage to check out, they say alternator was charging battery, but occasionaly stopped (mainly when a lot of load of load was put on the engine). i suspect that my alternator is faulty and will need replaced.

    any thoughts on what else it could be, i though the belts maybe loose and slipping, but that seems fine also.
    Last edited: Dec 19, 2008
  2. 230K

    230K Hardcore MB Enthusiast

    Jun 1, 2003
    09 E320 cdi Sport Estate, 98 E300TD Estate, 99 SL 500

    If your alternator has a free wheeling pulley i suspect that it is on its way out and occasionally freewheeling in both directions.

    Can you have a look at it when it is idling and watch for end play in it.

    Pulley can be changed with the proper tool and is not too expensive.#


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