I just bough an Rx-7 T2 and it has an aftermarket alarm. Some times the stock alarm goes off when I open the door. It is a different alarm than the one I control.When I lock the car I push the alarm lock key and it locks fine. Some times I Unlock the alarm and open the door and the other one does not go off.So basically I have two alarms, one that I control with a button and one that goes off whenever it feels like it. Both sound very different. When the stock one goes off I get in the car and turn on the car and it stops. This happened to me 4 times at
1:30 am and around 2:30 am.

 

dude just rip them ***** out and install a good alarm system
i have one with a magnet that if it's not in this little box with the triggers, the car won't start, and if it's already running, once removed the car will stall out and not stop again

works well