Build an alarm for Trig

Build an alarm for Trig was going to be a quest in Van Buren, the canceled Fallout 3 by Black Isle Studios.

Background
Trig is attempting to build an electronic alarm for the path leading up to village, something which will alert the Ciphers to visitors. She can't quite get it working, though.

Science Boy
Use Mechanics (Mechanics/Easy) to finish the alarm, or show Trig how to make a primitive but equally effective alarm (Outdoorsman/Easy).