Hi, I am John Mc, a Ford dealer tech. I hope I can help you quickly and accurately. One moment while I work on your problem.
Will the key turn all the way around?
Not totally. It will turn forward (clockwise) and actually engage the starter and it turn backward (counter clockwise) to what should be the accessory position but it "free wheels" in between.
Usually this is caused either by the switch itself or the two plastic pieces that are in the column. This is how to replace the switch, it is pretty easy. It is down on the bottom of the column and it held in by 2 t30 screws. Just remove the 7mm for the wiring connection then you can remove the bolts for the switch. Once off you should be able to feel resistance in the modes of the switch. If you do your problem is in the column and you will have to remove the column and completely disassemble and reassemble it to replace the plastic linkages inside. Many people will get a salvage yard column as this can be a real pain to do the job if you have never done one.
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When you say the "7mm for the wiring connection" is that a 7mm bolt or is it a wiring connector? I see a white plastic cover that would be just inside the dash on the column, is this the switch I'm looking for?
I believe that is what you are looking for. It should have a hole in the middle with a 7mm bolt in the center. You take this bolt loose and the connector comes off.
Thanks for clarifying. I go see what further trouble I can get into.