well a new member and looking for help??? 1992 motorhome with f53 chassis, went to turn motor off and the key spun but did not shut off engine, replaced ignition switch,, same problem, is there some linkage behind the switch if so do i have to pull the steering wheel??

 

Welcome to the site!

I'd say you are on the right track and the guys in the Super Duty forum should be able to help you out. Your state chapter will have a lot of local information so be sure and check them out when you hit the road: https://www.ford-trucks.com/forums/forum163/