I'm trying to install a sub and amp on my 1990 300e the car came with a blaupunkt radio which doesn't have rca inputs. I purchased a line output converted and tapped into the speaker wire (black/red wire) but my sub and amp don't work. The sub and amp are both brand new so I don't think they are the issue and it is getting power. Anyone have a sub and amp installed that can help me out? Thanks in advance.

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