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Normally I wouldn't know that, but I just had my whole dash apart and that wire still has the scotch-lock on it. I didn't even remember why I had but it in there until I read this question.My Explorer had a wire in the stereo harness I tapped in to. Should be a light blue wire with a red stripe, IIRC. But it's been a while... may be a different color.
EDIT: Adsm beat me to it. If he says that's the color, it for sure is.