positive door pin circuit
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=116372
Printed Date: May 16, 2025 at 1:05 AM
Topic: positive door pin circuit
Posted By: schecter
Subject: positive door pin circuit
Date Posted: September 17, 2009 at 2:52 AM
hello all. I have searched and searched and I cannot seem to find the right way to phrase it or something, however, the problem goes like this. I am installing an alarm system (Stealth install) and have converted the manual doors to power, wired up a central locking relay gizmo. and now! the alarm system only has a (-) door trigger input, I have a positive door pin system (94 ford ranger) I have attempted to use a relay to reverse the polarity but that didn't work.. any suggestions? please help I would really like to get the vehicle back to my client asap....
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Life's too short
Replies:
Posted By: i am an idiot
Date Posted: September 17, 2009 at 6:08 AM
What kind of alarm are you using?
Posted By: schecter
Date Posted: September 17, 2009 at 9:57 AM
that is irrelavent. it has only one "negative door trigger input" its a chinese vsas system ------------- Life's too short
Posted By: schecter
Date Posted: September 21, 2009 at 6:02 PM
any one? there no way to just jumper something on the alarm bord to switch from negative trigger input to positive trigger input?
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Life's too short
Posted By: JWorm
Date Posted: September 21, 2009 at 6:37 PM
When you buy cheap alarms off eBay or the flea market you get a cheap product with fewer options. If your alarm had a jumper, you would have probably seen it already. Any diagrams or pics of the manual for the alarm you could post?
You need to use a relay to switch the polarity.
86 - positive door pin wire in truck
85 and 87 to ground
30 to (-) door trigger input of alarm.
Posted By: schecter
Date Posted: September 22, 2009 at 7:01 PM
thank you. i will try an spdt relay with this wiring. i had 87 & 30 backwards last time..
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Life's too short
Posted By: i am an idiot
Date Posted: September 22, 2009 at 7:16 PM
On the above configuration, having 30 and 87 reversed would not keep it from working.
Posted By: howie ll
Date Posted: September 23, 2009 at 1:42 AM
Wasn't the Ford Ranger built by Mazda? If so it would be neg. Which is why the relay didn't work. It would only show pos when the door was closed.
Posted By: howie ll
Date Posted: September 23, 2009 at 1:45 AM
Oops sorry just checked, the first poster is quite correct.
Posted By: schecter
Date Posted: September 23, 2009 at 12:44 PM
Thats What I thought, 30 and 87 reversed shouldn't matter, however, the alarm is triggered when doors are closed as opposed to when they are open. the alarm triggers backwards basically and it does this with and without the relay..... any thoughts?
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Life's too short
Posted By: schecter
Date Posted: September 27, 2009 at 12:14 PM
nobody has any solution or even an educated response???? please? ------------- Life's too short
Posted By: JWorm
Date Posted: September 27, 2009 at 5:38 PM
What wire (color?) in the truck are you connected to? It should be BLACK/ Light Blue (+) at the underdash light. This is a simple thing to do. Just have to wire a relay as I stated a few posts up.
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