95 Mustang Vert Door Trigger

I've done a search and found that someone else had the same problem but I didn't see what the results were. I've read all the wiring lists here and they all say the same thing. The door trigger/dome light is in the 12 pin plug under the kick panel on the driver's side. If the car has factory KE then the wire will be grey, if the car didn't have factory KE then the wire is BLACK/ light blue. There is only 1 grey plug under the driver's side kick panel and it is a 12 pin plug, however neither of those wires are there. My car is a vert with factory KE. I tried connecting to the door switch directly however there are 3 wires and none of them worked. I can open the doors without setting the alarm off. I really need some help with this. Thanks.

Why don't you use the wire on the underdash light itself. BLACK/ blue POS(+) The light comes pn when you open the doors.