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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.
You still didn't say if you mean the actual switch down on the column or the lock cylinder at the top, but I'll assume the switch down on the column. 2 things come to mind. Either you didn't plug the harness back up (or it's not tight and plugged up properly) or you didn't get the push rod into the slot properly.