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Thats the accessory power wire, it doesn't draw its power from it but is told to turn on by that circuit being energized. You can make an extension and tap it into accessory power in the bundle of ignition wires or connect it to 12v constant and take the faceplate off when you want it to turn on and off. I suggest the second since with no adapter thing when you turn the car off your stereo will go off with it. With the latter option you have complete control over when your stereo is on (dont even need your keys).
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