2004 E46 320d Battery Keeps Going Flat - Page 2

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  1.  
    #11
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    wardo75's Car Details
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    Further update

    Took it to the garage this morning, while he had his head in the boot checking the voltage he asked me to start it up and the negative terminal attached to the body in the battery box was sparking. Upon further inspection it was corroded. Took it off, sanded it down removed the corrosion etc put it back together and problem sorted.

    Obc reading a constant 14.3v when driving and 12.5v when switched off.
     
     

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    #12
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    thanks for updating the thread
     
     

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    #13
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    Bmw320d se's Car Details
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    Easy fix

    Glad its sorted
    Before you judge a man, walk a mile in his shoes; after that, who cares?! He's a mile away and you've got his shoes!
     
     

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    #14
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    Glad you've found the fault and by the sounds of it not too painful in the wallet department

    Sent from my GT-I9100
     
     

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    #15
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    Have a similar problem but I hope mine is the FSR unit, First step is full charge the battery then with engine stopped put a volt meter across battery terminals should be around 12V now start engine and check V across battery should be around 14v if so alternator is charging. next with ignition turned off remove earth lead off the battery and do you get a large spark when you touch the lead back on battery terminal, if yes you have a drain on the system so now start removing fuses one at a time and replacing and seeing if you still have a spark coming of the lead when its touched on the terminal by a process of elimination you should find where , I’m sure somebody on here should be able to tell you that putting a mA meter from detached earth to battery whet the normal reading should be my cars is not 100% at the moment so can’t give you a reading.

    Noldi
     
     

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    #16
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    Thanks for the replys folks and glad to have it sorted! Just need to reconnect the fsr and have a look at my MAF sensor which is playing up!

    Noldi - great explanation for checking voltage drain! Although my issue is sorted I am sure someone will find it of use!
     
     

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