If I am not mistaken one power input goes directly to the pos + side of your battery (Use minimum 10 gauge stranded copper wire for this) and the other goes to the stereos (usually blue wire and can be regular 16/18 gauge wire) that is either used for (an amp or power antenna) In your case, an amp. So when you turn on/off your stereo your amp will also turn on/off . For the 2 ground wires just make sure you run at least one of them (preferebly with 10 gauge stranded copper wire directly to the neg - side of the battery and the other one can be ran to chassis ground and may be 16/18 gauge wire. Good Luck.
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