Which wire?

[Dave]

Hi.
Anybody know which wire goes to ground & allows the interior lights to come on when the front drivers side door is opened on a 80sx Brava.
On older cars they had door switch's so finding the wire was easy, but the Brava has no switch.
I would be interested to know how this switchless system works if someone knows.
I would guess the wire is in the cluster that comes from the door through the side of the car & into the back of the fusebox.
The reason I need to know is for an alarm I'm fitting, this is the final wire but it has me stumped

 

[Chris_hlx]

Dunno if this helps but... When I wired the alarm in my Bravo, I took the a pillar trim off, found the wires that go up to the light and used a meter to test which was which. Then connected it up to there....works fine.

Chris