2004 E46 320d Battery Keeps Going Flat

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  1. 2004 E46 320d Battery Keeps Going Flat 
    #1
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    wardo75's Car Details
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    Ok, so about a month ago my battery died on my 320d, it had been getting a bit hard to start for about a fortnight so I presumed the battery was on its last legs. When it died I replaced it and all was well.

    Came out of the house this morning to start it and it was completely flat again. Over the past week or so it has been getting a little hard to start.

    I have read a little bit about the FSR but not convinced this is causing battery drain as my heater blower works fine with no problems.

    Can anyone offer me any advice as to what I should do next?

    Many Thanks
     
     

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    My boss had very similar symptoms with his E46 coupe and only by removing the FSR was he able conclude it was indeed
    faulty and was causing the battery drain.

    Assuming you've had the alternator checked I'd charge the battery back up and try removing the FSR?
     
     

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    wardo75 (05-09-2012)

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    Thanks for the reply mate.

    Can I run the car with no FSR do you know?
     
     

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    Quote Originally Posted by wardo75 View Post
    Can I run the car with no FSR do you know?
    I can only assume yes as my boss did for 5 or so days?
     
     

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    I will give it a go this evening and report back.

    Many thanks
     
     

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    Ok, so I disconnected the FSR last night, jump starteded and took it for a half hour drive.

    Using the OBC menu I was able to determine that when ticking over the voltage fluctuated between 13.5-14.5V and when i rev the engine it rises to approx 15.5-16V. I Presume this indicates that the alternator is doing its job?

    Anyhow I came out of the house this morning in anticipation only to find it flat once again.

    I now have a couple of questions

    1) Would driving the car for half an hour be adequate to charge the battery or would I need to remove it and put it on an over night charge?
    2) When ticking over, the interior lights flicker/pulse slightly. Is this an indication of a bad earth and would this cause battery drain?
    3) Has anyone got any other suggestions as to how to locate the cause of the battery drain?

    Any help again is greatly appreciated.

    Thanks
     
     

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    I'm certainly no auto electrician but realistically I think you need to charge the battery up overnight,
    imo a quick 30 mins drive with lights on etc won't put sufficient charge back into a depleted battery.

    If you still have battery drainage after recharging I'd go and get the alternator & battery checked out,
    most garages will do this for free and with regard to locating a battery drain you can rig up a simple
    bulb check test but a decent auto electrician should find fault in less than an hour?

     
     

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    16V sounds a bit high to me - I though 14.5 was more normal with the engine running...
     
     

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    Quote Originally Posted by P_Monty View Post
    16V sounds a bit high to me - I though 14.5 was more normal with the engine running
    no p monty any where from 13-16v is ok
    any more than 16v will boil the water in the battery and kill it
    less than 13v will not keep the battery charged up
     
     

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    Thanks for the replys folks.

    Update

    Checked all the earth straps on the car (Well as many as I could find/access) all looked in really good nick with no sign of movement/corrosion etc.

    Checked to see if the car was going into sleep mode (Which is was)

    Jumped started it last night and let it charge for about 30mins. Disconnected the negative terminal and left it overnight.

    Came out this morning, reconnected the negative terminal and same thing again. The battery is only a couple of weeks old.

    Taking it to the garage in the morning to check the battery and alternator for me then off to the autospark I reckon.

    Doing my head in
     
     

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