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Hope people can help. I have a 300c 2007, I am trying to change the head unit over. I have power for the radio, but no sound. I am still trying to work out what all the wires are doing. From mu photo Pair: Gray / Green = 12+ on the left Pair: Black / Green = Ground this leave 3 Pairs This is not enough cable??? for the Speakers, unless it is sending a digital signal to the amp??? Is the amp always on, or would this be controlled but the radio. From what I have seen pins 7 and 8 should be front right pins 9 and 10 should be front left I don't have cables where the rear speaker should be on 18 to 21 With the standard head in I do have left right front and back. Do I need a 12v feed to triger the built in amp. What am I Missing here. I am aware I might need a LOC "Line Output Converter" Hope someone can help MrPK21
