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Thread: Battery drain, of course

  1. #1
    Join Date
    Jun 2008
    Location
    spain
    Posts
    34
    My Cars
    bmw 520i e39

    Battery drain, of course

    As we all know, the general module is to blame for the great majority of our misfortunes. I sent to repair and the car worked perfect. No drain in a few days. My misfortune was having to leave the car at customs where a son of a b... broke the passenger window. When I picked it up, apart from the damage, the batteries were dead. I blamed that alarm must have been ringing for hours and drained.
    The fact is that it is not like that. If I leave the interior light on it does not turn off after 15 minutes, so something keeps the module active. I have the doubt that the spare window was not genuine Bmw (which specifies whether or not it is built in alarm) and does not close the circuit causing batteries to deplete.
    Could this be the cause? Otherwise all ideas are allowed ... apart from hanging the bastard who broke my window...

  2. #2
    Join Date
    Feb 2010
    Location
    Hampshire UK
    Posts
    8,867
    My Cars
    99 840ci Sport Indv
    First of all, if you haven't replaced your batteries do it now - a battery that has been left at 0% charge will be damaged and you cannot do any quantifiable tests until you have a stable voltage source.

    Once you have replaced both batteries then do some accurate current tests as detailed below:

    https://www.meeknet.co.uk/e31/E31_Ba...iagnostics.htm

    Sent from my SM-G935F using Tapatalk
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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