Hi Folks,

thanks for all your valuable tips, which I thoroughly have gone through and what shall I say - I finally found the fault.
It was a PICNIC* case. 11.png

Turned out I hadn't fully shut the drivers door, which was more or less jammed against the garage wall. Such I didn't see it being lightly open.
Lesson learnt: The courtesy light draws 1.6Amps 20.png
So, now everyone may laugh heartily at me

*Problem in carmechanic, not in car

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