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Since you have the oldest 2008 E9X M3, the alternator, plus belts and pulleys could be causing this. Search BMW belts and pulleys on Youtube (Kies Motorsports). There are idler pulleys with bearings that wear and start to wobble and make noise. I would take the car to a BMW Indy Shop to troubleshoot and electrical issue. It could be a crappy aftermarket alternator....the alternator install/unit could be warrantied for 1-2 years.
Also double check the IBS sensor wire that runs to small light blue connectors on the negative battery terminal.
Disconnect the negative terminal first, then the positive. The large red electrical distribution bracket has 2 plugs that release...one blue and one black. Try to release them and then reconnect. That red bracket also comes apart...in two pieces. Try to take it apart and reconnect using the 3 nuts/bolts.
Since you were left stranded, it could also be the battery cable recall. The battery cable runs from the trunk to the fusebox under the glovebox. So you have to take the interior apart. The BMW dealership will probably not replace the entire battery cable...but cut it near the front seat and just solder it to replace the last 2 feet. The fuse box connector is defective, so it can kill the power to the engine.
The blower motor recall is also an area under the glovebox....the wiring starts to cook/brown and could start a fire in rear circumstances.
You can look up BMW Recalls for your VIN online.
Pick up a CTEK battery trickle charger and portable battery booster (super small now, since they use Lithium batteries).
BROOKLYN!!
Cheers
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