While we are adding. Here is how I did my AUX input and disabled the CD Changer. Though I saw a thread somewhere about putting in a multi conductor switch to be able to switch back and forth. I don't use the CD Changer anyway.
http://www.expeditionforum.com/f42/aux-auxillary-input-1998-navigator-expedition-3-5mm-20358/
I am thinking about adding in a bluetooth receiver, wired in the same way.
wow awesome job. But when you enjoy playing your ipod/iphone wirelessly its hard to go back to being wired again.
I wish I had enough electronics background to figure out how to hardwire the BT cassette into the headunit. So its always ON and charged through the headunit