Battery keeps going flat......

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  1. Battery keeps going flat...... 
    #1
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    warost's Car Details
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    If I leave my X5 3.0i (2003) model for 3 days the battery is not flat but doesnt have enough to start the engine, it is a new heavy duty battery, a guy told me it is a common thing that happens because these cars are constantly alive electricaly but it is driving me mad as I only need a car every now and then.
    Is this something I just have to put up with ?
    Thanks.
    Stu
     
     

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    #2
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    That's rubbish if battery is good and being charged, the car should be happy to be left for a few weeks. When you do drive it, do you do more than a couple of miles? Have you checked the Alternator is charging properly? Is the battery the right power, the BMW Diesels take a lot of power to start, needs to be above 800CCA.
     
     

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    #3
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    danidge's Car Details
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    if the battery isn't holding charge properly it will drain quite quickly.
    have you ever replaced the battery?
    my old car done the same thing and i was checking for a paracitic drain for ages as i thought i wasnt likely to be the battery...
    it was the battery :P
    i would also check your charge rate cause if you alternator isnt charging properly it can kill a new battery if it keeps going flat.
     
     

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    #4
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    davidball123's Car Details
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    I have the same problem with my 2004 E46 diesel. I have fitted a new Bosch battery. I have checked the charging (12.4 V with engine off and 14.2 volt with engine running). Regardless of what is switched on (lights, airco radio etc) the voltage returns to 14.2 V so I think the alternator is ok. I have connected an ammeter across the battery terminals and it shows 3 milliamps after the car has rested for 20 mins. I get the same reading with the alarm on or off. Yet after two days standing there is not enough juice to start the car. Help !
     
     

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    #5
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    MONSTER's Car Details
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    warost - Your going to want to correct your thread title...

    YEAR - E/X** Number - Model - Problem

    ....

    How often do you drive it? As you said you only need it now and then... Has it sat around for while? Thats the number one reason why a battery drains as its sat doing nothing...


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    #6
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    Another battery discharge issue with no resolution listed. This is now the third or forth historic thread that I have read on the subject that does not reach a conclusion.

    Please update with the cause of the issue and resolution.

    thanks
     
     

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    #7
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    you're going to have to start pulling fuses until your drain disappears(1 by 1)
     
     

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    #8
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    Any chance you have a custom stereo in your car? I remember when I put my own radio in my E36, I forgot to wire the igniton wire properly to the amp or the radio (can't remember witch but I think it was the amp for my sub) and this drained my battery in about 2 days.

    Other wise i think octy900 has a good plan, pull fuses, but I'd pull about 10 at a time, and then narrow it down from there should save some time. Maybe you can hook up a ampere meter to the battery and see when it changes if you pull a fuse to find the problem even quicker.
    (It is a ampere meter right? Voltage will stay the same?)
     
     

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