I can confirm that the Tailwind solution does work. It's obviously the best combination of simple and effective.
I did some testing with DSP and without (jumper installed). DSP in and audio deck powered there is a background hiss with no volume. I think this is normal and has been present since I have owned the car. DSP removed and jumper in place the hiss gets louder. It certainly wouldn't be noticeable with the car running.
Is there some resistance needed to placed in the jumper to calm things down?
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