I'm trying to install a clarion DXZ845MC using a metra amp integration harness, basically the same as others but uses RCAs for the speaker connection. Whenever the mach460 amps get the amp turn on signal the speakers pop really loud. I've tried it with the rca unhooked trying to isolate what is causing the problem and it still does it. The long grey plug has power, memory, ground, amp turn on, power antena(which I can hook up but why), phone mute?????? The package says that the black/white wire is the amp ground, but there is no black/white with the harness. What am I missing here?