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Check to see if the negative trigger wire is grounded when the doors are closed. If they are, then there's the problem. Use a multimeter for this.
Check to see the ACC wire is only recieving 12v when the ignition is turned on and when the engine is cranking. If it is receving a constant 12v then it will trigger the alarm.
Unplug the shock sensor and see if there is a diffrence.
Also check to see if the orange wire for the brake switch is recieving a constant 12v. If it is reciveing constant 12v, the alarm will sound. It is only supposed to recieve 12v when the brake pedal is pushed to lock the doors while driving. I find this a pain in the back side so I disconnected it.
Please see attached the wiring diagram for the 838 (If it worked)
You may have to print it, it was a bit small on my computer.
BTW, Hooch, is that a dig at myself or the crap that we sell.