Quote:
Originally Posted by upallnight
Looks like the alternator is not charging at low RPM. Most likely the brushes are worn. You can replace the brushes and regulator if you are a DIYer.
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I agree. Classic electrical under voltage symptoms in an E53. I would replace the brushes in the alternator ASAP. They usually don't make it much past 100K. If it keeps happening, check the connections on the battery and have it tested.