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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
the horn relay is located above the warning chime module for the air bags, or the "blue box" behind your heater controls.
look to the top left of this picture.