[SOLVED] S211 red battery warning

Discussion in 'Electronics' started by Herishi, Jul 12, 2017.

  1. Herishi

    Herishi Hardcore MB Enthusiast

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    Car:
    2007 E280 Sport
    [​IMG]

    So I got this warning today, I'm guessing alternator but the car is running fine!

    Any ideas here?

    Thanks

    Steve
     
  2. KillerHERTZ

    KillerHERTZ Administrator Staff Member

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    Location:
    Cambridge
    Car:
    CLS63 AMG
    Battery Voltage very low. The W211 has 2 batteries.

    Did it say which one when you tried clearing the error? How old are the batteries?
     
  3. MikeInWimbledon

    MikeInWimbledon Hardcore MB Enthusiast

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    2007 E500 5.5. Previously E350 S500, E500, SL350, SL500, S500, E55
    Have you been using the car regularly?

    Or have you left it unloved for a while?

    Or have you done something to drain the battery recently? Lights on overnight etc?
     
  4. OP
    OP
    Herishi

    Herishi Hardcore MB Enthusiast

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    Joined:
    Apr 14, 2015
    Car:
    2007 E280 Sport
    I only have one battery in my 211 as it is the newer one (3.0l v6 diesel)

    Not done anything to load the battery and I've been driving every day.

    I got the dash in engineering mode today and noticed it took 3 mins before the battery voltage went for around 12v to the 14.5v level that shows the alternator is engaged, not sure why there was this delay though.

    Thanks

    Steve


    Sent from my iPhone using Tapatalk
     
  5. Dec

    Dec Hardcore MB Enthusiast

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    Is the battery original or do you know how old it is?

    Does your car alarm work properly.

    Dec
     
  6. OP
    OP
    Herishi

    Herishi Hardcore MB Enthusiast

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    2007 E280 Sport


    Yeah official mb battery only about a year old, I can see that there is an issue with the charge voltage, it takes ages for the alternator to kick in so the battery sits at 12v for a while before going to 14.4v

    Not sure if there is a controller or if it's just the alternator that needs replacing


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  7. andy27168

    andy27168 Hardcore MB Enthusiast

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    Hi,
    If you are convinced it is the Alternator at fault (it does sound like the regulator is at fault) you should just be able to just replace the regulator rather than the whole Alternator.
    I know on my CLS55 it is fitted on the back of the alternator and can be replaced very quickly leaving the Alternator still in place, I paid approx. £20ish for a OEM Bosch item, or MB part about £50.
     
  8. OP
    OP
    Herishi

    Herishi Hardcore MB Enthusiast

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    Thx Andy

    @merc85 can you get hold of these?


    Sent from my iPhone using Tapatalk
     
    1 person likes this.
  9. merc85

    merc85 MB Club Veteran

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    Car:
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    I've pmd you Herishi via Fb,

    Bosch Part number to help forum should be F00M346080

    Best get the number of the unit as there are 3 different regulators
     
  10. OP
    OP
    Herishi

    Herishi Hardcore MB Enthusiast

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    Car:
    2007 E280 Sport
    So sorted this issue today, the brushes on the alternator voltage regulator were worn to the extreme, however after fixing this I now have a glow plug warning light error


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  11. OP
    OP
    Herishi

    Herishi Hardcore MB Enthusiast

    Messages:
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    Joined:
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    Car:
    2007 E280 Sport
    the secondary issue is now solved, the pattern voltage regulator was putting noise on the LIN bus and preventing comms.

    When I changed to a new genuine Valeo Voltage regulator I was left with only one error, this was the glow output stage relay it's self, so once I replaced this everything is perfect :)
     

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