I have a 2005 fx4 with the 6 disc changer and the aux input for rear seat dvd player. I just bought an adapter to hook my ipod to it but in addition to the harness, it has a red power wire. My question is how do I power it? I guess I was thinking of splitting off of the power wire to the radio, but I don't know which color wire is the constant power. Can anyone tell me which wire is the constant power going to the factory radio? Also, is this the best way to power it?