It's very common for older MFSs to slowly stop working, and replacements range from $40-200, so repairing it is certainly an option to consider. '92-97 F-series/Broncos use Motorcraft SW5591. To access & remove the switch, see this album:



Once the switch is out, you'll need a T10 driver, a small flat-blade screwdriver, electrical contact cleaner, fine steel wool or emery paper, some silicone electrical grease (NOT dielectric), and some paper towels IF YOU WANT to attempt to repair it yourself. If you fail, you haven't really cost yourself anything but a little time.

See this for testing:
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Owner caption May 2011 · Photo 3721 of 5000