I have a 2008 Expedition LTD with a 6 disk changer no nav and I have been looking for the answer to this question for months
I want my Sirius tuner to turn off when I open the door like the radio does. In my 1997 Explorer I got power from the "Hot" wire going to the radio it was great I opened the door and the thing would go dead, when I fired up my truck it would turn on by itself.
On my 2006 Mustang I took a line right from the fuse box I tried that in my Expedition apparntly power is always going through the fuses, so I see the power going to the radio as the only way to make it work.
Maybe someone here knows the color code I would use to tap into.
I also want to use the stock Satellite antenna, and can't find the Sirius box...where the heck is that thing.