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-   -   BATTERY LIGHT HELP (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/56434-battery-light-help.html)

UCrewX5 01-11-2009 01:24 PM

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MATTYP 01-12-2009 06:16 AM

Was thinking about taking the alternator off to see if there is a fault with that.

Zulu95 01-12-2009 12:37 PM

If somebody went to the trouble of covering the light then there obviously is a problem and it either was going to cost too much to rectify and was not impacting battery charging or it could not easily be found. The charge voltage is just a tad low. There is enough to charge the battery but not enough to drop the light. Most likely a faulty alternator regulator circuit. It should stay at 13.85V most all of the time for a Bosch. There was a way of boosting this published in Roundel some time ago. It involves putting a diode in circuit internally in the alternator which requires pulling and stripping the alternator. The extra 0.5V voltage drop across the diode SC junction fools the regulator resulting in a higher charge voltage across the battery. Somebody may actually have the article to hand or it may be online. Try a web search.
Cheers and GL.

Zulu95 01-12-2009 12:39 PM

Try here:

http://www.detomaso.nu/~thomast/alternator/

MATTYP 01-15-2009 03:40 PM

Taken the alternator off, and had it checked and the voltage regulator is faulty. So i am having a new fitted. Thanks for all the help


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