it goes to the remote trigger line, or lacking that, the power antenna lead of your aftermarket head unit, so that +12v is sent to the line whenever the head unit is turned on, thus telling the amplifier to turn on, too.
dc
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Where is the remote trigger line?what color wire? I dont have a power antenna cause I have a Honda which has the antenna built in to the rear windsheild. I also dont have an after market headunit.Its factory, I wanted to keep it cause it has a CD changer.