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mercury switches

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=479
Printed Date: August 25, 2025 at 12:15 PM


Topic: mercury switches

Posted By: snowman
Subject: mercury switches
Date Posted: April 26, 2002 at 6:28 PM

Need help,  I'm installing clifford arrow -3,  I have a topper on the back of my truck that I purchased mercury switches for the lift doors  (pin switches would be to hard to install with limited space) The mercury switches have two leads(polarity not marked) The alarm control unit has only a single lead for hood / trunk  switch. Any help greatly appreciated. Thanks



Replies:

Posted By: kaufman_sd
Date Posted: April 26, 2002 at 7:02 PM

Depending on the type of input on your alarm, negative (-) or postive (+) triggered will dictate how to hook up your switch.  If negative trigger, connect one lead to the alarm input and ground the second lead of the mercury switch.  If postive input, connect one lead to the alarm input and the second lead to a 12V source.  Polarity on the switch itself does not matter.  If you are connecting through the hood / trunk switch chances are this is a negative input.   Hope that helps and Good Luck.  If mercury switches don't work good for you I have had good luck with magnetic reed type switches for application similar.

Steve


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