i have an 04 ram and i want to install an aftermarket radio and i have the infinity system. i tried just getting a wire harness to do the install but got no sound. i bought a pac radio replacement interface because one place told me that would make it work but i am still getting no sound. i looked on pac website and it looks as though there is none compatible with my truck. am i looking for the wrong thing or am i wiring it wrong. pleas help!