Car Alarms: 1990 Nissan OEM alarm malfunctions, 1990 nissan 300zx, nissan 300zx

Question
Hello,

I have a 1990 Nissan 300ZX 2+2 that has been acting goofy. The OEM car alarm will sometimes randomly go off (lights flash and horn sounds). I have to turn the key in the door to disarm it. My question(s) are:

Is there an explanation for this?, easy fix?, etc?

Should I Permanently disarm the OEM alarm system (by grounding the red/gray alarm wire), since I have an aftermarket alarm system already?


Thank for your help, it is much appreciated,

-Zach  

Answer
All things being equal, there is something worn or broken causing
it, and it is probably in the door tiggers.
A bad one or rusting sensor triggering the OEM system perhaps?

Inspect all doors for faulty trigger pin switch.

Good hunting.

ALARMTEK