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When you say it doesn't start do you mean it is not cranking when you turn the key?
But if you remove the ignition switch you are able to get it to turn over by jumping the wires at the back of the switch? Am I understanding you correctly?
Since the Expedition will not start with the key but will start if you slide the ignition switch, the problem is there is a plastic actuator rod that moves by the ignition key cylinder that moves another plastic rod which moves the ignition switch lever. What happens is there is a metal pin the falls out of the first actuator rod and stops the vehicle from starting. Ford still sells the actuator rod for about $15. The problem is the steering column will have to be removed and disassembled to replace the rod. Below is a picture of the rod.