Car Alarms: Need to reset car alarm system, ford mustang gt, car alarm system

Question
I purchased a used 1997 Ford Mustang GT with only one key and no key fob. Took it to the dealership and they found that the battery (or fuse) had been removed so it had to be replaced before a new key could be programmed.  They said it might have been disconnected due to sensitivity. A few days later, I unlocked the car with the key and the passenger door was opened and it set off the alarm. I tried turning the key in the door as directed by the dealership and the alarm would not shut off. After about 5 minutes the alarm shut off. Then the key would not work to start the car. Called Ford, they said there was a switch under the dash and to hold it in and turn the key. We cannot find the switch and are not able to get the car started. I also tried one of the two new keys that were made and it did not work either. Any help would be greatly appreciated.
Thanks,
Monyu

Answer
I can not assist here without that valet/overide switch.
It's an aftermarket system though, so have Ford
tell you where they found it, and also,
the alarm seems to be doing it's job.
At least we know it's installed correctly
which is actually a good thing here.

Ok, try this.
Put the key in the ignition, and turn forward
all the way just before cranking. Then within
5 seconds, locate, press and hold in the
valet/overide button, found under the
dash area, (push button, spring loaded)
until the installed LED (the blinking light)
in your dash area goes on solid,
and the siren chirps once.

(Your valet switch might be the toggle
(on/off) type. in this case, key on,
flip switch in opposite direction,
then turn the key off.)

This should reset the alarm, and reset
the grounded relay on the starter wire,
allowing you to start the engine.

At this point, the only thing working would
be the keyless entry from the alarm,
if it came equipped that way.

Just Repeat these steps to place it
back to usable armed mode.
You may get 2 chirps, confirming it,
and the lights may flash twice as well.

That should do it.
If you want to remove it at this point,
take it to your neighborhood installer
for this, or buy the wiring chart
(Go to: www.vehiclewires.com)
for the vehicle, and reverse engineer it wire
by wire, until safely removed.

If it does not work out this way,
you will have to replace the system
with one you know how to operate
and what to expect. Don't want to
get stuck in another bad situation.

Let me know what happens.

Robert Martin/CEO-ALARMTEK
www.CARALARMINSTALLER.com