Car Alarms: e-150 van (ford van) after market alarm., ford van, trigger system

Question
will installing an after market alarm on this van w diode on two wires for door triggers set off alarm w/no reason after 30 or 40 min?? the two wires i found show + when door open and - when closed. + door trigger like it appears. any help will be much appreciated.
thanks,

Answer
ONLY 1 DOOR TRIGGER IN THIS TRUCK.
IT'S BLACK/BLUE AND IS A POSITIVE (+)
TRIGGER SYSTEM. ONLY THE VIOLET (COMMON COLOR) POSITIVE
DOOR TRIGGER WIRE FROM YOUR ALARM SHOULD
BE ATTATCHED TO THE BLACK/BLUE.

REMOVE ALL OTHER CONFIGURATIONS.

THEN TRY IT AN SEE WHAT'S GOING ON.

ALARMTEK