Something is shorting to ground and causing the problem. If the alarm has a motion sensor and that is now bad, that could do it. Try disconnecting the alarm if possible. Also, close the door VERY gently--does it still blow? If not, i'd suspect the motion sensor. Otherwise it is a hot wire touching ground somewhere. These can be hard to find. The most logical approach is to isolate the circuits (door lights, alarm, etc.) on that fuse and test them individually. Good luck.