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So I'm trying to install a Pioneer HU that I took out of my old truck and am putting in my 05. I got one of those wiring harnesses that plug into the stock one, then you wire the other end to the Harness on the stereo. It says for up to 07 chrysler vehicles. I hooked up the Constant, Ignition, and Ground wire then tested to see if it would turn on and nothing :/ Anyone know why?