Question about BMW 525

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2003 bmw 525i

Changed battery and still not holding charge, brake light on and ! light on

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  • Anonymous Mar 31, 2014

    whado I check

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  • BMW Master
  • 5,568 Answers

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.

Posted on Jul 02, 2008

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