i have a 2000 eclipse and i am using the stock infinity cd player. it has an amp under the right passenger seat that runs all of the stock speakers. i bought the scosche converter at walmart. how do i wire it up so i can have rcas for my amp? do i connect it to the wires off of the harness that clips to the amp. or directly right behind the cd player itself? and how many wires do i need to connect to it?