Is it + or -?

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=12952
Printed Date: September 06, 2025 at 8:13 AM

Topic: Is it + or -?

Posted By: JamesAyers
Subject: Is it + or -?
Date Posted: April 29, 2003 at 7:36 PM

My door trigger measures 12v+ when the door is closed. When the door is opened, the meter measures 0 volts.

The vehicle database says it is a negative trigger. Several others have told me that it is a positive trigger. If I hook up the wrong polarity wire from my alarm system, will it smoke, or just not work correctly?

James

Replies:

Posted By: jayts95
Date Posted: April 29, 2003 at 7:42 PM

What type of vehicle and what year?

Posted By: JamesAyers
Date Posted: April 29, 2003 at 7:47 PM

1997 GMC Sierra 1 Ton 4 door crew cab pickup

I have isolated the purple (or violet) wire at the back of the headlight switch, and that is what I am using as a test for the door trigger.

One other concern, this vehicle has a dome light override switch. Will this affect the arming/disarming of the alarm?

Posted By: draasch
Date Posted: April 29, 2003 at 9:39 PM

this should take care of it for you......

Dome Light PURPLE (-) 4 PIN BLACK CONN. IN DR. KICK PANEL *

* PURPLE (-) Wire Also Located At Headlight Switch. WHITE (-) Wire At Courtesy Light Can Also Be Used But Will Not Trigger Alarm If Dome Lamp Override Switch Is Turned On

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Good Luck
David
Ace Security
813-376-9778
Tampa
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