Car Alarms: how do i override my factory car alarm system, car alarm system, neutral safety switch

Question
i drive a 2000 ford expedition with a factory alarm my key alarm doesn't work ,i tried all my key alarms and it wont work ,nothing works in my car without deactivateing the alarm, i cant even drive my car, how do i override the alarm system?

Answer
The 2000 Ford Expedition did not come with a factory alarm.  If you have an alarm it would have been an after market add on.

Are you sure your battery in the vehicle is good?  Also, make absolutely sure the gear shifter is in Park or Neutral when trying to start the vehicle as the neutral safety switch would keep the vehicle from starting as well.