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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 6 Series > E63 / E64 6 Series (2004 - 2010)

E63 / E64 6 Series (2004 - 2010)
The E63/E64 BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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  #1  
Old 11-19-2016, 08:40 PM
hfahmy hfahmy is offline
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Battery charging issue only after startup

Been getting the "charging system malfunction" message with the red battery light for couple of days after 10-15 mins driving from cold start. Measuring the voltage through the lighter while car is on, I get less than 12v. I know that this sound like an alternator...

Strange things is when I turn car off and then on, I get 14.5v with no issues at all... so, alternator works fine without any issues, only after second start and car is warm...

Thaoughts?
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  #2  
Old 11-19-2016, 09:08 PM
HerbP HerbP is offline
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I would check your voltage under the hood at the jump terminal. When you get the light do not turn the engine off. Measure the voltage under the hood again. If the battery dips above or below 12 volts again, the voltage regulator is probably bad. Have you worked on anything around the alternator lately, & have you checked your battery voltage with the engine off?
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  #3  
Old 11-20-2016, 04:59 AM
hfahmy hfahmy is offline
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Quote:
Originally Posted by HerbP View Post
I would check your voltage under the hood at the jump terminal. When you get the light do not turn the engine off. Measure the voltage under the hood again. If the battery dips above or below 12 volts again, the voltage regulator is probably bad. Have you worked on anything around the alternator lately, & have you checked your battery voltage with the engine off?
Thanks Herb!

I also checked voltage at jump terminal with light on and it is around 12v with car running. Battery is less than a month old, voltage is more than 12.5v when car is not running.

I am planning to change alternator this week but surprised that when restart car alternator works normally???

I bought the car 3 months ago with lots of work already done, transmission change, valve cover gaskets, timing cover gaskets, oil switch, water pump, belts, etc. all done by the dealer

Last edited by hfahmy; 11-20-2016 at 05:09 AM.
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  #4  
Old 11-20-2016, 10:14 AM
HerbP HerbP is offline
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It is possible that the single wire that comes off of the alternator is loose, or damaged. Do not buy any alternator that has been rebuilt, due to many problems that others have had with them. You can buy a new alternator on EBAY for around 300.00. Make sure to get the correct model, & read the fine print to make sure it is new.
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  #5  
Old 11-22-2016, 03:01 PM
hfahmy hfahmy is offline
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I scanned codes today by INPA and I saw code 27DA. Does this confirm alternator problem?

I purchased a brand new OEM alternator and will replace this week
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  #6  
Old 11-22-2016, 05:12 PM
HerbP HerbP is offline
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27DA does confirm alternator failure. My guess would be to check the single to make sure it is connected & not loose, based on your description. This wire tells the DME how to handle the charging voltage.
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Old 11-22-2016, 07:42 PM
hfahmy hfahmy is offline
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Quote:
Originally Posted by HerbP View Post
27DA does confirm alternator failure. My guess would be to check the single to make sure it is connected & not loose, based on your description. This wire tells the DME how to handle the charging voltage.
Thanks again Herb!

If this single wire is not connected or lose, does it cause the alternator to not charge the battery and the red battery light to come on? Again, trying to confirm that the problem is the alternator not this wire
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  #8  
Old 11-22-2016, 08:30 PM
HerbP HerbP is offline
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It will cause the red light to come on, but the charging will not be controlled by the DME.
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Old 11-22-2016, 08:45 PM
hfahmy hfahmy is offline
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Quote:
Originally Posted by HerbP View Post
It will cause the red light to come on, but the charging will not be controlled by the DME.
Thanks again!
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  #10  
Old 11-27-2016, 06:11 PM
hfahmy hfahmy is offline
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I changed the alternator and no charging system malfunction issues any more
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  #11  
Old 11-27-2016, 07:22 PM
HerbP HerbP is offline
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Glad you got it solved.
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