SOURCE: 2003 bmw 525i
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.
SOURCE: radio, windsheild wipers, power locks
The best thing to do is tuen the key on and teat all the fuses with a 12 volt test light. Replace any fuse that test bad.
SOURCE: 1993 bmw 525i fuel pump
Hi, your fuel pump is located in the trunk underneath an access cover on the passenger side. remove the screws on the cover and you will see the in tank pump and sending unit. when replacing your pump, make sure to note the position of the 2 fuel hoses so you don't accidentally cross them when putting in the new pump.
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
SOURCE: oil change reset for bmw 525i
You only need to hold the left odometer reset button while turning the key to position 1 (Accessory). Keep holding the button for 5 or so seconds until any of the following shows in the display: OIL SERVICE or INSPECTION with RESET or RE. Release the button and press it again for another 5 or so seconds until RESET or RE flash. While the display flashes, press the button one more time briefly. If done correctly, END SIA should show up for a few seconds. All done.
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