I have a remote control Thunder Tumbler(works great) and just got a ford gt and the controls of both work the tumbler

Sounds like the remote is not the same frequency as the car! Take it back to the shop!

go to the trunk of the car and put the key into the trucnk tumbler and open it, that will deativate the valet mode...

You have to remove the plastic cover on the bottom of the ignition column.Where the tumbler goes in you will see a shiny pin that hold the tumbler tooth column.you can drill that pin out carefully and use patience starting with a small bit size and working your way up.don not remove any aluminum material from the column as your new tumbler will not lock in to the column. These cars and columns are plentiful in the junkyard if you are not successful and don't take a lot of time to swap out.

You can't do it; the Theft System it's integrated to the vehicle control computer ECU/PCM; you need install one INTERFACE to make this work.

Review this Wiring Diagram and this comment: when installing a 791 TRANSPONDER BYPASS System on this vehicle it will be necessary to remove the BOTTOM STEERING COLUMN Cover and IGNITION SWITCH TUMBLER to gan access to the Factory Transponder System around the Ignition Switch. To do so will require that you first look at the bottom of the STEERING COLUMN COVER to identify the screw holes from the IGNITION SWITCH TUMBLER RELEASE PIN HOLE, that is required to remove the Ignition Switch Tumbler, the IGNITION SWITCH RELEASE PIN HOLE is the SMALLEST Hole in the plastic cover in this picture. NOTE *** to remove the IGNITION SWITCH TUMBLER, a TORX #15 Bit on a Screw Driver will work just fine. Incert it up into this hole and press, at the same time, turning the IGNITION SWITCH ON and the Tumbler will pull out at the same time. This Must be done to remove the IGNITION SWITCH TUMBLER so that the BOTTOM Steering Column Cover can be removed to gain access to the TRANSPONDER SYSTEM built around the IGNITION SWITCH.

Also, its possible that you need other details from the Taurus's Owners Manual.

Hope helps.

I think your thumbler is shorting and blowing the fuse..; replace the tumbler..

your ignition is wired to the tumbler.. if thats shorting it will explain your issues.

It sounds like the classic "switch needs replacing". You only need the tumbler replaced. Before installing the new tumbler take it and your door key to your local locksmith and they can key the new tumbler to work with the old key. This saves you from have to have two different keys.

There is a good possibilty that the key tumbler mechanism "rod" has become disconnected to the door control mechanism. These rod connections are plastic and will break. Also if someone is trying to unlock the door while someone is trying to open the door either from the inside or outside; this could cause this link to break. If someone tried to "jimmy" the lock using a slim-jim they could have caused a disconnection or breakage.
The last of my theories is the locking tumbler could have become loose because of a tumbler spring lock clip that may be broke or malfunctioning. This keeps the tumbler in place while turning the key. If the key continues to turn more than it should or is very loose this could be the problem. However this is rare.
You will have to take the inner door panel off to gain access. Check visually to see if this rod from the key tumbler to the door mechanism is loose on top where it is connected to the key tumbler OR on the bottom of the rod where the rod connects with the door control mechanism.
The "L" part of the rod pushes into the hole of the plastic clip and normally there is an rotating arm clip lock that flips over onto the rod and locks onto the rod, holding the rod in place. If the clip has broken it should be replaced (available to auto part stores).
Let me know if this helped or in you have additional information or questions. Feel free to contact me on FixYa.com!

it sounds like a problem with the tumbler, my sierra has done this before, next tim it does this dont try the fuses, just turn the key to the off position and give er a whack on the underdied of the column right under the key area. some trucke for what ever reason have i loose accessory wire right where they meet the tumbler exchange.

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