Have 1996 Ford F250 that won't turn over. The truck is permantly in the on position. No matter what position the key was in the truck stayed in the on position. It doesn't go to off and will not turn over the engine. Replaced the ignition lock cylinder because the other one felt like it was floating. Still won't turn over. Everything else looks fine. Any ideas on what's wrong here?

SOURCE: F150 ford truck 1990 key wont turn over engine new ign. switch

we have 1998 ford f15 we replaced the ignition and it still wont start the truck,, the key turns over now and the radio and everything comes on but it wont start, what is wrong???

SOURCE: 1989 F150 ignition cylinder switch

Remove the ignition switch cylinder and inspect the contacts in the column. Look for dark spots, scratches, excessive scuffing. My guess is that cleaning the contacts with a little tiny piece of sandpaper and perhaps bending them out a little (so there is more pressure between the contacts when you reinstall the cyclinder) will cure the problem.

SOURCE: 2004 Ford F250 Superduty Truck Steering problems

I have had this same problem after thorough checking it ended up being a bad steering box. after replacing the box it was fine

SOURCE: 1995 Ford Mustang Engine Won't Turn Off

the ign switch should take care of it i agree with you

shack

SOURCE: stuck ignition cylinder 1992 ford taurus

It is not necessary to have the dealer do this, think of the cash! Though it does require patience and time. The pin you are supposed to push in goes into a slot when you have it in run position, since you cannot turn it to run you have to make a slot for the pin to go into, with a drill. Be very careful as you only have a 1/4" of play before you break a washer behind the cylinder. Once you have drilled out the key far enough to the pin hole you can take a nail set and tap the pin up, you can tell when the pin clears the housing, then it just takes wiggle, patience and tinkering to get the cylinder to slide out, keep the green washer and the metal slot washer. Metal slot washer goes in first with green plastic washer ontop of that with lock cylinder in last. You can play around with the new lock cylinder and washer before insertion to determin correct direction.

Here are official directions with inoperable lock cylinder. They say drill out retaining pin but it just spun in circles for me - I looked at new cylinder and saw how it worked. retaining pin needs a place to go.
Removal & Installation (Non-Functional)
NOTE:Use this procedure to remove ignition lock cylinder if key is missing or cylinder is frozen.

Disconnect negative battery cable. Disable air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS. Wait at least one minute for air bag back-up power supply to deplete. Remove steering wheel. See STEERING WHEEL . Using a 1/8" bit, drill out retaining pin located below lock cylinder on housing. DO NOT drill deeper than 1/2".
Using channel lock pliers, twist lock cylinder cap until it separates from lock cylinder. Using a 3/8" drill bit, drill down center of ignition lock key slot about 1 3/4" until lock cylinder breaks loose from its base.
Remove retainer, washer, and lock cylinder gear from housing. Remove metal shavings from lock cylinder bore. Replace housing if damaged. To install, reverse removal procedure. Connect negative battery cable. Check air bag system for proper system operation. See appropriate AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS.