Car Alarms: 1994 Corolla Alarm wont stop, alarmtek, dash area

Question
I'm installing a stereo in my cousin's corolla, after unhooking the battery and
re-attaching everything the alarm started going off.  We tried the key in the
ignition, but nothing.  We also tried the key in the door, but the key won't turn
left, only right.  Is there any other way to disable the alarm, short of cutting the
wires.

Answer
I need to determine whether it's a factory alarm
issue or, if it's an aftermarket system you are
dealing with.

Is it: Headlights flashing, car horn honking
and a worded SECURITY" light in the dash flashing?
(doubtfull since none of the notes show this
car as having a factory alarm system)=FACTORY

Or,

is it: flashing parking lights,
an LED in the dash area, and a siren
going off?= AFTER MARKET

Let me know more on this to better
advise you on a course of action
to take.

Best Regards,

Robert Martin
CEO/ALARMTEK
CARALARMMAN.com