I have a 2005 Winnebago 33' voyage. I want to replace my current radio. It works fine but I need to have a accessories jack for my Sirius satellite. Is there a radio that will replace the current radio one for one. I thought that the radio that was in it had a jack on the back side, but the line that was plugged into goes to a light next to my antenna warning light on the dash, I can't figure that one out? Thanks in advance.