No one has answered this out of all the people who have asked in the past so maybe tech will help! My Mach 460 doesn't work it has highs but the door and rear bass do not work. I am not the original owner so I don't know what they may have done. I am trying to put the car back the way it was from factory. The amps are connected with factory plug ins but I dont know if someone bypassed them in the wiring or where to look. please help