E39 528i 1998 battery lights comes on but get 14 volts

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  1. E39 528i 1998 battery lights comes on but get 14 volts 
    #1
    BMW Master
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    Genesius's Car Details
    Model of Car:
    E46 325i Touring
    Year of Manufacture:
    2001
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    Touring

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    My battery light keeps randomly coming on and then going off. There's no pattern and I have no idea what's causing it.

    I have 12.5v at the battery with the engine off
    12.5v at the alternator plug and earth
    14.2v at battery when engine is running.

    What could be causing it?
     
     

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    #2
    BMW Crazed
    Car Details
    E36 TDS's Car Details
    Model of Car:
    325 TDS
    Year of Manufacture:
    1997
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    manual
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    Touring
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    When I had this exact behaviour on my E36 it turned out to be the alternator.
    What initially threw me was the intermittent nature of the symptoms, though giving the alternator a hard tap would usually see it right for a few days.
     
     

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    #3
    BMW Master
    Car Details
    Genesius's Car Details
    Model of Car:
    E46 325i Touring
    Year of Manufacture:
    2001
    Transmission Type:
    Manual
    Car Body Type:
    Touring

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    Aug 2010
    Location
    Essex
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    The light on comes on for a few miles then goes off. Thanks for the reply, I feared it would be the alternator
     
     

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    #4
    BMW Master
    Car Details
    Genesius's Car Details
    Model of Car:
    E46 325i Touring
    Year of Manufacture:
    2001
    Transmission Type:
    Manual
    Car Body Type:
    Touring

    Join Date
    Aug 2010
    Location
    Essex
    Posts
    283
    Thanks
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    Thanked 10 Times in 9 Posts
    Fixed! Changed alternator and now its sorted. Pretty easy DIY job actually.
     
     

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