Post the build date and somebody can look up in the TIS.

Often when I'm seeking e53 solutions I'll search E39 which had a much bigger user base.

Found a good handful of mentions of the same happening and not many solutions.

The only suggestion i saw with exciting was to confirm there's a good ground. Check the DC voltage from the frame of the alternator or block to the chassis. It should be less than 0.5V.

Checking the AC voltage at the alternator is also a worthy test. It should be less than 0.25v if more itt should be looked at with oscilloscope to learn why.


–awr–

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)