I've just fitted a second hand parrot kit with the ISO autoleads kit which came with it. Easy enough to tap into a 12v switched using a spade fuse adapter I got from a guy on here. There were 3 mute wires. I connected Mute 1 to the mute wire on the kit but the stereo doesnt automatically mute. Do all 3 mute wires need connecting or have I just connected the wrong one on the Parrot side?