Question about BMW Cars & Trucks

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92 bmw 525i the battery keeps draining

I bought 2 batterys an still the next day it drains it any suggestions

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  • JUAN SARABIA
    JUAN SARABIA Dec 05, 2012

    do i need a new alternator

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  • Expert
  • 256 Answers

You have a short somewhere in the vehicle ,If a battery keeps on go dowm,

Posted on Dec 05, 2012

  • John Doe Dec 05, 2012

    Take it in to have a chargeing system check done on it, ,

  • JUAN SARABIA
    JUAN SARABIA Dec 08, 2012

    do i need a a alternator cause i change it twice too

×

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

mosthated357
  • 91 Answers

SOURCE: 1996 Chevy Blazer battery draining/won't start

What normally you have to look for is that your belt is running properly because your car might be running a lot more off the battery and not so much of f the alternator, but normally if the alternators bad it will drain the battery even if the cars not running.. Yes your first thing you would want to do is check the wiring and al that just because thats cheap and easy but most likley you wanna get the altenator tested...you can get that done at advance auto.. please rate me if you get a chance and if you have any other questions just let me know ill check up on your problem..

Thanks,
Steve

Posted on Jan 03, 2009

  • 320 Answers

SOURCE: 1998 Corvette drains the battery in less than 2 days.

No, corrosion will not cause a battery to drain, even if the corrosion is on the terminals. Several factors can cause battery drain, I would first have the battery tested to see if the battery it self is not bad. If the battery is good, then the most common is a short. All most all new cars have a certain amount of drain,(measured in milivolts) this drain is for clocks and computer memory's, and it would take several days of a vehicle sitting for the battery to be drained. Don't immediately assume you have a problem if you see 2-6 milivolts of drain on a battery with the key out, now if your battery is being drained after being parked over night, you have a problem. The easiest way to pin down the problem short is to disconnect your positive battery cable from the battery, take a 12 volt test light and clamp one end to the positive cable, and hold the probe to the positive post. Now if you have a short the light will come on. Have someone help you by pulling the fuses one at a time. If when a fuse is pulled the light goes out you have isolated the short to that system. If you pulled all the fuses and the light never went out try disconnecting all the wires from the alternator, 9 times outta 10 do this will let you know where your short is. If the system is not critical like power locks some people just leave the fuse out. 

Posted on Mar 05, 2009

  • 6 Answers

SOURCE: battery drains in my 1984 BMW 318i

I have the same car I had the same problem.If you have the correct battery for your car with the same problem you have a short or positive ground in your dash/electric fuel pump/fuse box also be carefull of how you take the key from the ignition and if they're old replace them.

Posted on Apr 17, 2009

  • 1 Answer

SOURCE: 2003 BMW X5 fan runs after engine is off, drains battery

if you mean the interior fan
replace fan control resistor driver side footwell in climate housing

Posted on May 27, 2009

  • 3 Answers

SOURCE: my 2000 lincoln ls battery keeps dying have bought

make sure the light switch is turned to the off position and not on auto . had the same problem and this corrected the battery drainage

Posted on Feb 19, 2010

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