2005 BMW 525i Battery Problems?


My 2005 BMW 525i’s battery keeps running out. This started about a week ago. The battery ran out and I jump started it. It was ok for a bit then it ran out again. when the battery turns off I get a brake light and an ABS light and a control systems light, which then turns off on its own once the car starts…

sounds as if your alternator is done or too weak to keep the battery charged up. so the vehicle is running mainly on your battery & once it’s too low, your car dies…

do that too often & you’ll eventually kill that battery. How old is that battery? usually a date stamped on a sticker is on it… if you think it’s over 5 years old, pull it off and have it load-tested for FREE at the local parts store

autozone will also do a charging system test FOR FREE if you can keep it running long enough

Bmw Battery Problems

Hook an ammeter in series with the battery to measure drain. Begin pulling fuses unless the drain goes away, after which you will have narrowed it right down to the method that’s causing the drain. Or, by way of casting off that bulb. However I doubt that bulb by myself is thoroughly draining your battery in a single day. An ammeter is somehting that measures current (amps). Many voltmeters have a present-measuring mode. Should you do not have one, they may be about 20 bucks at a hardware store. Connecting it in sequence method disconnecting one of the battery leads from the battery (it’s not relevant which one). The ammeter has two wires. Connect one of the most ammeter wires to the battery, and attach the opposite wire from the ammeter to the lead from the battery. The equal lead and terminal on the battery that you just disconnected.

You need to get the battery on a battery charger, unless you like the potential of damaging your alternator by overworking it, and if not get it fully charged, minimum 2 hours at 10 amps, best is 12 hours at 2 amps.
While the battery is charging clean the battery posts and terminal ends with this tool…
http://www.walmart.com/ip/16006673?adid=…

Tighten the terminals back on as tight as you can, and now you can see if you have another problem like the alternator. The car will die in a couple days if the alternator is bad.

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