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What is wrong with my 2003 BMW 525i?Battery Drain

I have replaced my old battery with a new one. My battery isnt holding any charge. It will shut completely down while driving it and ! symbol will appear. Also when I try to Jump start it the battery is so drained that it will not start. WHat is wrong with my car?

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Excessive power loss due to alternator bad..take to parts store so they can check it..diode trio is bad letting power back thru the alternator..basically it wont shut off now and will kill the battery after several hours..

Posted on Dec 26, 2013

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Check the charge rate and do a drain test prob alternator ....

Posted on May 09, 2014

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SOURCE: 2003 BMW 525i--could an improper jump start blow a fuse?

new altenator,sounds like you put the cables on the wrong way round

Posted on Jun 14, 2009

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SOURCE: Battery 2003 BMW 525i

have the alternator checked by a shop that is qualified to work on your car.

Posted on Oct 06, 2009

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    have the alternator checked by a shop that is qualified to work on your car.

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    new altenator,sounds like you put the cables on the wrong way round

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    If the brake lights are really on (?) this represents about a 4-5 ampere drain that would drag down most batteries in less than a day. (Could be over 100 ampere/hours.)
    I don't know your car but brake lights can be controlled by a switch operated by the pedal suspension or a pressure switch that monitors hydraulic pressure in the braking circuit.

    If your brake lights are on, the switch that controls them has failed or a relay that is operated by the switch.

    If the car seems sluggish or pulls when driven, it could be a failure in the ABS circuit since that is a high-demand (normally intermittant) load.

    The best way to locate the problem would be to monitor the current drain with a meter in series from the battery (engine off, monitor the ground side) and pull and replace fuses one-by-one to see which circuit is the culprit.

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