I was hoping that someone could explain how XM Satellite radio wiring works a bit. Specifically XM's satellite radio box uses Ground, Audio Common, and Drain Wire is shown in the Connector Terminal Identification section of the manual. Ground has bunch of noise from the all the automotive electronics, making it seem like it would be impossible to get clean audio into the radio. Which leaves me to believe that the "Drain Wire" and "Audio Common" are used in some way to produce a clean audio signal.
Thanks for your time!
Thanks for your time!