The color of the remote wire out of the head unit should be solid blue in color. If you have any doubt, get yourself a test light and and touch the blue wire on your radio. no power when radio is off and power when radio is on. I suggest testing the wire due to the fact that newer radios may have different wire configurations. Also, depending on what type of radio you have(example: sony, pioneer, kenwood) you can actually visit their web page and download the instruction manual.
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