I have a freind in Turkey who was eating off my ear for owning a MB, he had a problem with his car - it was some diesel E that had the ghost drain issue.

His problem was rectified by a big relay type item and it cost him quite a wallet gouge.

Did you try to test the alternator diode brigde?

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)