okay, so i just bought a new Kenwood amp yesterday and i installed it. But dumb mistake i made was when i was mounting it, pulled a cord while it was on and i guess a fuse blown or something short circuited and i'm not sure what. i replaced the radio fuse under the dash(which was blown) and the ECU/RADIO under the hood, but those didn't do the trick. i pulled the HU out and put the red and yellow wires together to get continuous power and the deck and amps turned on like it never happened. So i tested the power on both the yellow and red wires and the yellow had 12v like its suppose to but the red had 0 when the ignition was on and off. Does anyone have a clue what it could be ?