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Looking at the gauge of the fader wires (more like bell wire, much thinner than average-grade speaker wire), that is an indication that nothing more that pre-out signals should ever be flowing through the fader circuit.
Your head unit should be new enough to have it's own fader anyway, so trace the speaker wires from the fader and splice into them instead.
Typically MB uses gray/yellow and black/yellow wires for their speakers...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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