2002 E46 330d - parasitic battery leak

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  1. E46 330d - parasitic battery leak * FIXED* 
    #1
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    i am having a dead battery after leaving my car alone for 3 days. i have had a new battery fitted and the problem persists. alternator output has been checked.

    i have read several posts on here about how to try to find the leak. i have also read and tried to follow the wikihow guide

    http://www.wikihow.com/Find-a-Parasitic-Battery-Drain

    i follow the instructions:

    - set the meter to read DC current.
    - disconnect the negative lead.
    - connect one meter probe to the battery post
    -connect the other meter probe to the negative cable.

    but i dont get any readings on my multimeters ( i have tried 2 meters)
    on any of the settings.

    other things to note:
    the alarm goes off when the battery lead is taken off. when the meter is connected as above i cant get the alarm to switch off (the alarm or car dont respond to the key buttons) the boot lights or any light for that matter dont work.

    i must be doing something very wrong or my car is configured different.

    advice is so very desperately needed. i need the car daily now for the school run and cant have an unreliable car..
    Last edited by 330diesel; 21-11-2009 at 12:32. Reason: ISSUE FIXED
     
     

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    What you have to do is put the meter in circuit so that you can read the current. If your alarm is going off, then your meter is not set up correctly. Most meters require you not only change to amps, but also move the +ve lead to a different socket. Did you do this?
     
     

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    #3
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    hi

    one meter has the wires fixed. my old trusty rapitest.

    on the other which i bought from argos today for £25, the only one they do. the black wire goes to 'com' and the red wire to a hole marked 'mA' (fused 200mA max) the settings are on A (with a dash and dotted line under) i tried all numbers in this setting 2m, 20m, 200m

    when you say the meter has to be in circuit.. isnt that what i am doing? by breaking the circuit and then connecting the meter to the two ends (cable and battery post)

    isnt the meter supposed to complete the circuit again and let the current thru. but it doesnt seem to be
    sorry to sound thick.. neal.
     
     

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    It does sound like you are putting the meter in circuit . Could be a bad earth...try a different ground.
     
     

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    but its the huge black wire that connects to the battery that i am using. its got me flommoxed...

    looks like gonna have to give it in to an auto electrician.

    annoying tho.. sounds so simple on wikihow and others have used it fine, why not my car
     
     

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    Leave your -ve lead disconnected on the battery and try the +ve tap and chassis ground in the engine bay
     
     

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    will give that a go tomorrow.

    thanks neal
     
     

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    Keep us updated
     
     

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    If you have a drain and your meter only reads 200ma you may have blown a fuse. I would use a meter with a 10a range for this job.
     
     

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    330diesel (21-11-2009)

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    #10
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    hi

    did as gildersol said and i am now getting a reading.

    the reading i am getting is 0.029 when the multimeter is set at 2m.
    (black lead connected to 'com' and red led connected to '10A' jack)

    i have read that the BMW E46 should have a reading of 0.040 when asleep and mine is below that.

    any ideas as to what is goin on?
     
     

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