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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.
pull the switch out for the lights and see if its melted in back. I had the same problem I guess this is common on stangs. I had to buy a new head light switch. make sure you label the wires so you know back where they go. also you may not have enough wire slack to just pull the switch out from the console so be prepared to rip it down to the cluster.