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Hello and thanks for your question. My name is ***** ***** I will do all I can to help.
Is it Crew Cab or just 2 doors? thanks.
Alright, you don't have an advanced type scanner capable of communicating with the VSM (Vehicle Security Module) by chance do you?
OK, reason I ask is all the door ajar switches feed into this module and it would be easy to see which one was ajar when all the doors are closed.
It's likely the drivers door, as it gets used most often, but it could be any of them.One thing you can try is spraying some brake cleaner up in the latch and trying to clean out as much dirt as possible, then spraying some WD 40 or PB blaster all up in the lock assembly where it catches the striker, the ajar switch is stuck with dirt, that can sometimes free it up, open and close the door about 10 times after cleaning the lock assembly as best you can and it can help. Otherwise, I would have to advise you to get the truck hooked to a scanner capable of seeing exactly which door ajar switch is causing the problem, otherwise you'll have to take off every door panel to unplug every door ajar switch to see which one is at fault.
Here is the wiring diagram to give you an idea of what I'm referring to, if you see the all the door ajar switches on the right go into the VSM module.
Here is what you will need to fix it, it goes on the door lock assembly itself. Let me know if you have any further questions.http://www.ebay.com/itm/Ford-Lincoln-Door-Jamb-Open-Warning-Ajar-Contact-Switch-SW6129-OEM-4L3Z13713AA-/201381278768?fits=Year%3A2006%7CModel%3AF-250+Super+Duty&hash=item2ee3427430:g:CgsAAOSwPcVVlJX5&vxp=mtr
That's probably gonna be the lock cylinder little tab that is supposed to close when you pull the key out. That tab gets worn. You'll need a new lock cylinder and need to order it keyed to your existing keys due to those keys being programmed via PATS system. They aren't too much. Local locksmith can handle that job.
Let me look.
You can pull the wire to the key in tab. Check this video, pull the plastic shroud off, pull the ignition lock cylinder out, and remove that wire from the key in tab.https://www.youtube.com/watch?v=Ib68433p6JM
That's not going to get the door ajar light out though, you can pull the wire's out of the chime under the dash.
so when it's grounded you get no chime sound?
If you want to run a jumper wire to the tab wire and ground it somewhere that would fix it right? Let me look.
Is the bottom of the steering column shroud off now? the plastic half?
alright, take the bottom of the dash out on the very bottom, it's either on the column and you should hear it dinging and be able to feel it vibrate in your hand, or it's near the brake pedal shaft. It's right there somewhere.
Should be able to unplug it , but it will never ding for any reason after that of course.
the interior lights being on all the time is going to be that door ajar switch, but which one I can't tell you without hooking up a scan tool to monitor the signals to the VSM, or pulling every door panel and checking all of them unfortunately.
I don't want to really get into modifications. Another expert may assist now that I've opted out. Thank you.