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Common 3 Wire
# Many aftermarket electronic sensors, including but not limited to, impact, glass, radar, etc., have only three leads to connect if they don't plug directly into the alarm itself. Others including dual stage sensors do have more , but this will relate to most of them. Connect the ground wire to a clean and solid chassis ground.
# Connect the power wire to a constant (+) 12 VDC source.
# Third, connect the (-) output of the sensor to an available (-) inuput of the alarm. If all inputs are in use by other triggers, use diodes to connect more than one device / trigger to one input of the alarm as shown above.
Note: if you are installing any type of vibration or glass breakage detector with a remote start you will need to bypass the output of this sensor while the vehicle is running by remote. If the remote start does not have an on board relay for this, connect the output lead of the sensor(s) to terminal #87a of an SPDT relay and connect terminal #30 to the input of the alarm. Connect the "(-) sensor bypass output" of the remote start to terminal #85, and connect terminal #86 to a constant (+) 12 VDC source.

http://www.the12volt.com/carsecurity/page5.asp


Hmm, seems like I am going to learn how to do this thing. Any other comments on this article?