need wire description ('91 200)

[Jokeree at aol.com]

I don't have the Bentley yet, but I need to know what function a broken wire 
of mine has. I was pulling out the stock non-functioning Bose/Audi radio when 
I noticed a broken wire coming out of the "power" black plug harness(Audi's 
harness) not the other "speaker" red plug harness. The wire is white with a 
blue stripe, is this some kind of antenna wire? Please help, thanks for any 
info.

    Dave Farrer