Apparently the connector itself had some kind of issue so the first attempt did not work.

I pulled a connector and as much wiring as I could access from a junked ML in great condition. Splicing this in from inside the car did the trick.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles