Looks like the foglight switch. In 99/00/early 01 it was in the 94-98 location. In 01.5 it moved to the shifter bezel.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.