Isolating dome light from door trigger

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=69512
Printed Date: May 14, 2025 at 4:36 PM

Topic: Isolating dome light from door trigger

Posted By: SoundAudio
Subject: Isolating dome light from door trigger
Date Posted: December 29, 2005 at 6:21 PM

I am having a hell of time with this. If you have to use the same wire for the door trigger and the dome light how do you isolate them from each other? How is it different if you have a positive door trigger and pos. dome light output, or negative door trigger and pos. dome light output Thanks for the help.

Thad

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Good Luck!
-Thad

Replies:

Posted By: infinkc
Date Posted: December 29, 2005 at 7:25 PM

all depends if you have a negative door trigger or positive door trigger and negative dome light or positive dome light. usually the alarm has a built in relay or you add one for the domelight. what you are doing is the alarm sends either a neg or pos signal to the domelight depending on what setup you have. the door trigger doesnt come into account because when you disarm the car the alarm is turned off so there wont be a false trigger. basicly all the dome light feature is doing is making the car think the door is open when it is closed.

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There are 10 types of people in the world, ones that understand binary and ones that dont.

Posted By: Mike M2
Date Posted: December 29, 2005 at 8:30 PM

Why would you have to use both the door triggers and the dome light on the same wire?

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Mike M2
Tech Manager
CS Dealer Services

Posted By: OhioMike1101
Date Posted: December 29, 2005 at 9:46 PM

Mike M2 wrote:

Why would you have to use both the door triggers and the dome light on the same wire?

We did yesterday when we put a FM900A in a '77 Caddi ! :)

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South Side Audio
2501 S. High St
Columbus, OH 43207

Posted By: Mike M2
Date Posted: December 30, 2005 at 6:39 AM

Ok, why? If it's for door trigger, use door trigger wire. What reason is there for needing the dome light wire after that? If your adding supervision it wouldn't be on the same wire....

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Mike M2
Tech Manager
CS Dealer Services