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Christian,
Your pic of the meter connected to the open cct output of the charger tells me it is producing the same output as mine and mine is charging ok.
It also indicates that the charger has the correct polarity with respect to the alligator clips.
As previously suggested by another member, try testing your car battery to confirm polarity with your DMM.
So, I have reached the limit of my knowledge as I have never experienced a reverse polarity battery.
I trust the IIS community can assist in resolving your case.
Steve
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