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Old 01-06-2011, 11:08 AM   #1
STEEEZ
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540i draining power

Hi all,

about 2 months ago, my 2002 540i started showing symptoms of losing electrical power while driving (dash lights flickering). At one point it did not start, and I had to replace the battery.
About a week later, it started to occur again, so I replaced the alternator.
Everything was fine, until a week later, it died on me again !

Thinking that the battery was dead (again), I got it replaced under warranty. Now fast forward to present. Yup, it's dead again. I believe it is leaking battery power overnight perhaps, but I have not sourced it.

Any input/suggestion is appreciated by members and sponsors.
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Old 01-06-2011, 12:57 PM   #2
540guy
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If I'm not mistaken the FSU is known to go crazy and start operating at random times, which could be draining your battery overnight or something.

I don't know too much about it so someone else may have details or a different solution. Good luck.
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Old 01-06-2011, 02:03 PM   #3
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Thanks, will check the FSU and hopefully that does solve the problem.
From what I read, it seems like that is the culprit...
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Old 01-18-2011, 11:01 AM   #4
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So I took it to BMW, and they said the battery is dead. I already knew that. Trickle charging it over night didnt work either.

Now they claim a "BMW" battery has more cells regardless of the exact same cold cranking amps (CCA), and is "larger" than the Eliminator battery I got from Canadian tire.

So, they want to sell me a BMW battery ($265 !), just so they can do a diagnostic check.

At this point I've exchanged the battery 3 times in 3 months, and CT will question and might even deny a free replacement cause they will say the problem is with my car. According to BMW this is not an equivalent replacement.
I dont know if CT will take the battery back and refund me my money now. I dont want to pay twice for a battery.

Can someone shine some light on this "after market battery Vs. BMW battery" issue ? I've never ran into a battery problem such as this.
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Old 01-18-2011, 11:48 AM   #5
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It might be the resistor.
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Old 01-18-2011, 12:32 PM   #6
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Quote:
Originally Posted by STEEEZ View Post
Hi all,

about 2 months ago, my 2002 540i started showing symptoms of losing electrical power while driving (dash lights flickering). At one point it did not start, and I had to replace the battery.
About a week later, it started to occur again, so I replaced the alternator.
Everything was fine, until a week later, it died on me again !

Thinking that the battery was dead (again), I got it replaced under warranty. Now fast forward to present. Yup, it's dead again. I believe it is leaking battery power overnight perhaps, but I have not sourced it.

Any input/suggestion is appreciated by members and sponsors.
i got energizer battery from Walmart, works better than OEM, OEM replacement
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Old 01-18-2011, 02:51 PM   #7
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Quote:
Originally Posted by Oyster View Post
i got energizer battery from Walmart, works better than OEM, OEM replacement
Apparently the 5 series draws more electrical charge than typical bmws.
I think the dealer is trying to bullsh!t me with this, and sell me a battery. ONLY TO be able to diagnose it then.... which then could be something else totally.

What model/year is your car and how long have you had the battery for ?
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Old 01-18-2011, 08:39 PM   #8
MLue1
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Quote:
Originally Posted by STEEEZ View Post
Apparently the 5 series draws more electrical charge than typical bmws.
I think the dealer is trying to bullsh!t me with this, and sell me a battery. ONLY TO be able to diagnose it then.... which then could be something else totally.

What model/year is your car and how long have you had the battery for ?
Did you do the simple thing like clean the contact area of the terminals with a wire brush?

On one of your last posts you were going to look at replacing the FSU,... did you replace it? In most cases this is the cause.
http://www.540i6.com/finalstagereplacement.html

Maybe alternator,...unlock your OBC and run test 9
http://forums.bimmerforums.com/forum....php?t=1241963
.... watch the voltage at various times such as idle, part throttle, full throttle and under braking, you can even enter this mode before startup in position 2 to check the battery voltage as well.
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Last edited by MLue1; 01-18-2011 at 09:09 PM. Reason: Adding info
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