Thanks nylyon. Stereo has "speed adjustable volume" option and level settings for that, one of which is 0(off) in the menu options.(plus a lot of options I will never use, does anybody?) No wires in glove box but your suggestion got me thinking. Pulled glove box, which was easier than whole dash panel. Used flashlight, mirrors and some moves better left to a contortionist and saw the wire going from switch, around and around, and back up to cd changer/radio plug. It's been spliced in to the main plug so it does relate to the stereo system somehow. I'd rather it controlled the trailer lights, that would be useful. I now know where to focus at least. Gonna go do some research on it. At least I don't have to pull the dash trim panel only to find out it's indeed tied into the stereo. And I guess it's not TT related so I will stop posting about it on here. Much Thanks to ALL for their ideas. They were very helpful and humorous.
2010 Jayco Jay Feather 23k
2004 F150 Lariat SCrew 4x4 5.4L 3.73
Reese Strait Line Trunnion Dual Cam WD