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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 01-05-2014, 02:37 PM
Bloodbathgsxr Bloodbathgsxr is offline
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Location: Canton
Join Date: Jan 2014
Posts: 1
Mein Auto: 2000 BMW 540i
Exclamation 2000 BMW 540i power drain

Hi there, I have a 2000 BMW 540i that is a headache! It has a very annoying power drain loss problem, to where when you shut the car off and let it sit for about a day or two you would have to jump it. I have changed the battery, and checked the alternator at autozone and read fine. I jumped it again today and while it sat in park and revved the engine and noticed the interior lights dimming. Sometimes when I open the door you can see the interior lights start to dim down and even at time flash from bright to dim. once the car is on the road it runs fine with no issues
I love the car but hate this power drain/loss problem, does anyone else have this problem? And if so what have you done to fix it or even if anyone has any suggestion it will be greatly appreciated!

Thanks again,
Your Pal
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Old 01-05-2014, 08:31 PM
bluebee's Avatar
bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 19,181
Mein Auto: 02 BMW 525i M54 automatic
Originally Posted by Bloodbathgsxr View Post
does anyone else have this problem?
I don't think there has been a single BMW E39 owner who hasn't had this problem, at least once, and most of us have had it at least twice.

Start here:
- The most often recommended method to diagnose overnight parasitic battery current drain including the FSU (1)
Note: Your mission, should you decide to accept it, is to add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need, in seconds!
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battery issues, electrical issues, jumping car, loss of hope, loss of power, power drain

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