I mostly listen to podcasts on my iTouch when commuting and got tired of wearing earphones, so I decided to install a new stereo with a USB input in my '01 TT Roadster. I bought a Sony CDX-GT-640UI and the appropriate (behind the dash) harness from Crutchfield. That all worked fine and was not hard to do but the Crutchfield harness does not include a way to connect the original CD changer with the radio though the new radio has a aux input and a bus port as well. It's not a big issue since the new radio has a CD player built in and I rarely play CDs but it could be fun to make that connection too.
The Bose radio that I took out has a port diagram on it and I can identify most of the connections but would rather buy a harness as opposed to building one. Does anybody know of a vendor that sells an appropriate harness?