Not sure what your asking, Paul. The Sirius audio output is the 1/8" mini jack converting to the RCA cables. It's a standalone unit (link) and the car docking kit is this one. I can't use the FM modulator because my tuners FM output is broken... DOH!

I've not done the ground shield test yet, but I'm nearly convinced I have a bad connection on the sled, which if that's the case I won't get to attempting to fix it until the weekend. Is it a solder or a crimp connection for the sled connector to the RCA cable?