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Just as an fyi: I found the cause for my problem: It was the ground cable attached to the wiring harness adapter plugged into the radio. I did check all cables and couldn't find the problem. I decided to switch the receiver for a new one that had 4 channels + sub output to the amplifier since the old one had only 2 channels output and ... the noise was gone.
So as a tip for others, check the cables for the adapter first.
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1986 911 Carrera Cabriolet 3.2 Prussian Blue Metallic
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