Thanks for the speedy replies. In my owner manual, all I see is "Interior Lights" and "Clock." Where do you see the radio listed? I totally agree, by the way, that it must control that item, but curious to know your source.
A few years ago when this issue first started to come to happen, we jammed a CD into the CD player. Do you suppose that the player is just sitting there trying to play or eject that CD?!?!?!! Could this be the issue all this time?
Also, of the components you mention, which do you think would consume power in that oscillating manner reflected in my test light?