Alarm Question

Well I spent almost 400$ to fix factory alarm from going off and now its back again. Sensor in door was problem? Question
1. Can I just disable it so I can lock car
2. Can I just do a aftermarket install or would the factory problem affect the
Viper alarm or similiar brand

what year car is this? all the mustangs ive had from 96 on up just have a passive system that does basically nothing but honk when you lock it. you could smash the window and drive away it wouldnt do anything

I would recommend installing a clifford or prestige alarm. i've had both of these before and they both worked great. your installer can dis-engage (if thats a word) your factory alarm and install the new alarm to work with your locks, auto start, etc...

just cut the wire under the hood going to the fuse box that says alarn it has a square fuse on the wire