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msw357
Joined: 29 Jun 2006 Posts: 13 Location: San Diego
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Posted: Thu Jul 06, 2006 1:25 pm Post subject: '92 850i Battery Drain |
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Hi All,
Just starting having a battery issue on the 850. So, went out and had the existing battery replaced with a new batt. Interstate is the brand, as the old one did have some warranty left. I have only owned the car since last August and it has been trouble-free until lately. Any commonly known issue on 8 series cars with battery life? I don't drive it alot, but if I let it set for more than 2 days, the battery is dead! Any ideas would be appreciated! Thanks |
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edjack
Joined: 04 Feb 2002 Posts: 3887 Location: San Jose, CA
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Posted: Sat Nov 04, 2006 4:00 pm Post subject: |
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One of the electronic subsystems is not going to sleep. You'll need to monitor the battery current as you pull fuses of the different subsystems.
Is your HVAC blower erratic? If so, the cause of the battery drain may be the final stage resistor. _________________
Ed BMW CCA member since 1987 (Nr. 62319).
'97 540i 6 speed Aspensilber over Aubergine interior. |
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msw357
Joined: 29 Jun 2006 Posts: 13 Location: San Diego
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Posted: Sat Nov 04, 2006 4:44 pm Post subject: Re: '92 850 Battery Drain |
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Thanks for the tip. It was actually the second battery that is on the passenger side that was draining the new one down. It still had some warranty remaining, so Interstate changed it out for $40. Now its all good. Thanks for your help.
Mark |
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edjack
Joined: 04 Feb 2002 Posts: 3887 Location: San Jose, CA
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Posted: Sat Nov 04, 2006 5:34 pm Post subject: |
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Aha! I didn't know that the 850 has 2 batteries. If they are in parallel, you must replace them together. _________________
Ed BMW CCA member since 1987 (Nr. 62319).
'97 540i 6 speed Aspensilber over Aubergine interior. |
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msw357
Joined: 29 Jun 2006 Posts: 13 Location: San Diego
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Posted: Sun Nov 05, 2006 11:12 am Post subject: Re: '92 850 Battery Drain |
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I found out the hard way! But, now I know. The 850 has a lot of features that others do not have. 2 batteries is one of them. 12 cylinders is another! Thanks again.
Mark |
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