Car Alarms: F-150 problem, valet mode, alarmtek

Question
I have an F-150 1999, I have tried 2 different alarms on it, but the same problem appears. After 50 or 60 minutes that I arm the system, the alarm goes off automatically. Even in valet mode its the same after the 60 minutes aprox the blue led turns off. Its a viper 1002, When its not in valet mode the system starts to trigger.

Answer
Your question prompted this
automated responce to a
DEI equipment support inquiry...

DEI EQUIPMENT SUPPORT SERVICES ARE NOT
PART OF THE INFORMATION THAT I OFFER HERE
AT ALARMTEK.

You must have missed that BIG note I placed
on the ALLXPERTS site about VIPER.

You have the wrong guy here. I don't
provide support for DEI equipment or they're
clientel, PAST or PRESENT.

Too many people have been asking
for the service they should be providing, and
I won't do they're job here any longer.

I now refer these inquiries to either my forum
at www.installsupport.com, www.directed.com .

Good luck with your
DEI info quest.

ROBERT MARTIN/Owner
ALARMTEK AUTO ALARM
CARPROTECTOR.com