Hey guys I bought a Audiophile headunit for my truck it has the 3 plugs in the back. I have the plug under my rear seat, and there is a plug behind the headunit that was taped up it is an 8 pin plug and i see that the sub plug that goes into the audiophile needs to be an 8 plug as well, but the plug does not fit into the back of the headunit. What is this plug for?? is there an adaptor or harness i need to plug this one into the headunit? Please help me out, i'm very frustrated Or is the Plug back there behind the dash burried or hidden?