etlsport,

Since you have your system out and can look at it easy, can you describe the audio input running from the CD changer to the head unit? Can you easily identify the audio only lines? I'd like to run a switch in between the CD changer and the head unit, allowing me to input my MP3 player through the CD input. The switch will allow me to choose the CD or MP3. Is it easy to identify the audio lines?