I know it must be in here somewhere but I have searched and cant find it. 2000 320 wagon, it came with the phone and no changer, I had a changer so I installed and used the cable from the phone, works great but I would like to hook the phone back up to (works for 911) do I need another cable? I don't see an "output" on either PH or CD. How does that work to have both? Is there a cable with two ends?