Problem for BMW Cars
Generic problem for all BMW 525 Cars
2003 bmw 525i
changed battery and still not holding charge, brake light on and ! light on
Solution #1
posted on Jul 02, 2008
Rank: Wiz
Expert
Rating: 85%, 1860 votes
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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