BMW Questions? Ask a BMW Repair Expert for Answers.
If it started when you jumped it, chances are the issue is with the battery getting discharged and/or the charging system malfunctioning. Do you have access to a voltmeter you're familiar with so you could perform a few basic electrical tests under my guidance?
OK. First, make sure the battery cable terminals are clean and tight. Once that is done, let's try that voltmeter;
Please let me know what you find.
My regular hours are weekdays from 2 to 8 PM AST. Hope to hear from you then.