1997 E36 328i - Battery light

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  1. 1997 E36 328i - Battery light 
    #1
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    Ferret's Car Details
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    330Ci
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    2001
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    Anyone know how the battery light actually works ?

    It's NOT driven by voltage !

    Sometimes from my alternator, it can be putting out about 11v with no battery light on.... And other times it can put out 11v with the battery light on, and it will slowly fade out when I slowly rev the engine.

    And as you come to a junction, and the rev's drop lower and lower, you can see the battery light fade in. But the voltage is still the same.

    So I know it's not voltage - So how is it driven ?

    Thanks,
    Ferret !

    EDIT: Oh, and I did learn one thing tonight... The Brake Light circuit on the Check Control will fail at about 10.5v, the ABS and ASC will fail at about 9.5v (Dead battery anyone ? ) and the airbag system will fail at 8.5v-9v
    You learn something new everyday
     
     

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    #2
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    deanh1979's Car Details
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    2002
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    Have know idea if this helps but I had a similar fault with a transit.

    The battery light kept coming on sometimes dim sometimes bright. Then i went flat. However the alternator was absolutly fine. What it turned out to be was the charging circuit went through the screen wash circuit so when I washed the windows and the pump was dry the fuse blew. This stopped the battery from charging and of course the alternator was reading good voltage.

    Worst thing is RAC said it was the battery, called em out again and they said alternator.

    And it turned out it was just a fuse for the screen wash.

    Some things seem like they really are built backwards
     
     

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    Ferret (31-05-2011)

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    Ferret's Car Details
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    Quote Originally Posted by deanh1979 View Post
    And it turned out it was just a fuse for the screen wash.

    Some things seem like they really are built backwards
    Yes, that is backwards

    I think i've pin pointed the cause of this failing alternator..... Rain !

    When it's dry, it's fine, but as soon as it starts raining, thats when the problems begin.

    And last night was some seriously heavy rain, and thats when the voltage dropped really low.
     
     

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    Ferret's Car Details
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    Anyone know how this light works ?

    It's more for curiosity than anything !

    Oh, and just to add, below about 8v everything fails, including my voltmeter, so I couldn't get a reading below that... But the engine does chug on for abit longer
     
     

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    #5
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    mykez69's Car Details
    Model of Car:
    E36 328i Convertible
    Year of Manufacture:
    1996
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    Convertible
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    Quote Originally Posted by Ferret View Post
    Anyone know how this light works ?

    It's more for curiosity than anything !

    Oh, and just to add, below about 8v everything fails, including my voltmeter, so I couldn't get a reading below that... But the engine does chug on for abit longer
    Solar panel.
     
     

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    Ferret's Car Details
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    Quote Originally Posted by mykez69 View Post
    Solar panel.
    Good idea, unfortunatly, I was driving home from work tonight at 23.15 when it died...... I suspect a solar panel might not help as much as i'd like

    EDIT: Ebay comes up trumps though: http://cgi.ebay.co.uk/12v-Solar-Pane...item19c1ab7e7f
    Not bad price
     
     

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    mykez69 (01-06-2011)

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