1966 Optional switches: Rear Air & Hazard flasher. (I need info)
i found the instructions for the Mopar flasher kit and i clear describes installing the little red light and the toggle in these exact location as this Barracuda that i posted. Not that some other kit may want the same location, but to me this is the flasher kit on this car.
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The reason I concluded that it was a rear defogger option is that you can see the air intake grille in the right rear interior panel in one of the photos.