Question about 1998 BMW 5 Series

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My battery keeps going flat even after a short drive .. has done this for years even tho the battery is in good condition..

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  • yadayada
    yadayada May 11, 2010

    has the battery been tested, never assume the battery is good.

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2 Answers

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  • Master
  • 426 Answers

You have a parasitic drain on the battery, the way to check is to do a draw test using a multimeter.
This can be done at home or by any local repair facility.
Happy motoring

Posted on Sep 29, 2009

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  • Master
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Alternator belt loose ..or idler pulley worn, last but not least.... the alternator is going bad.

Posted on Sep 29, 2009

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Posted on Jan 02, 2017

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The easiest solution to your problem is your alternator is failing.

Beyond that, the battery itself may be bad - or there could be a phantom drain that has to be sniffed out.

Have the battery and alternator load tested to verify they are ok.

Any parts store will do it free.

Thanks for using FixYa - a Very Helpful rating is appreciated for answering your FREE question.

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Flat battery on s type 2001


Hi

Sounds like the battery to me.

Have they done a heavy discharge test on your battery at the garage, and can assure you it is 1OO% ?

The alternator is supposed to keep the battery topped up on charge nicely, even if it is only a few mile run every day, with your head lamps and heater going full blast, and then your fan runs on after switch off.
By the way it should only run for short time, how long have you heard yours run ?
Possibly the thermal switch is staying on too long ?

Did they test your charging rate on your alternator too, at your garage ?

How old is the battery ?

Is it of recommended type ? and not a cheepie from Halfords ?

Hope I have been of some help.

Good Luck

John.



Jan 05, 2009 | 2002 Jaguar X-Type

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