I'm replacing the Bose Speakers in my son's 92 Z. I've read several articles and how to's, but I guess I'm missing something. He has an Alpine head unit and we are trying to tap into the OEM wiring harness to connect the new speakers. I used the orange wire and the black wire which I assume to be the Hot and Ground wire. The speaker gets power, but there is no sound. Am I using the correct wires? Will I need to run new wires from the head unit? Thanks for the help?