I have a used but excellent condition PAC Trunk-LOC line out converter. I used it when I added a sub to my car. It has it's own remote turn on lead for your amp, no need to tap into an ACC wire. It has dual adjustable sensitivity, it comes with instructioins, great for adding a sub to an OEM system.
$15 shipped to the lower 48.
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$15 shipped to the lower 48.