Replaced the ignition lock and tumbler. Alarm going off nostart

you wont,, you will have to replace the ignition switch /tumbler to get the alarm back working.

Usually a sign the tumblers in the lock cylinder have worn out or jammed.
You may have to get the lock cylinder drilled out and replaced.

You either have a shorted clock spring contact under the steering wheel or the airbag is defective.

You can probably go to a junkyard, and steal the tumbler out of another cars ignition, just make sure that you have the set of keys to go with it. As well, if your ignition key is for your locks as well, make sure that you take those tumblers out of the door because you'll need those as well.

Hi,
Before going to get it fixed. Spray some WD-40 into the ignition cylinder where you put the key in and let it soak. The lock tumblers may just be stuck and need lubrication. If thet fails then call a ford dealer and ask how much for a coded (this means the key will match your existing key and also open your doors) and an uncoded ignition cylinder ( key will turn the ignition but you will need your old keys to open the doors) The Ford keys were designed where one half of the key operated the locks and the other half operated the ignition. If you buy a new ignition key and cylinder it will only be half cut to operate just the ignition. The cost of all this differs dealer to dealer, and don't forget that there are locksmiths in you yellow pages that will do this also
Hope this helps

look at the steering column below the ign lock and tumbler there should be a small hole turn key to on pos and push a small rod up the holethis then should release the lock and tumbler,no hole then wheel and coumn has to be stripped to get to lock retainer

Are you aware? you have the key and tumbler and another part under the dash on the steering column called the ingition switch.
They both have to be aligned in sync to operate properly.
Question? is this a tilt steering wheel,if it is and you dont know anything about it I suggest you get a professionel to do this kind of job.
You really have to know what your doing for this one.

need to be reprogrammed at dealer

might be ignition tumbler , my friend had same problem , the key sensor broke , there is reset process after new tumbler is installed

pull cover off of bottom and turn key to on and push pin up with scratch owl should be able to remove tumbler then