using relays for door pins

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flyboy172152

Member - Posts: 3

Joined: December 27, 2004

Location: United States

Posted: December 28, 2004 at 11:21 AM / IP Logged

how can i make + door pin output into a - for a car starter? i have tried the ways sugested on this site, but the problem is if i hook the +12 coming from the door pin to 85 on the relay and ground 86 it bypasses the pin swithch and then the dome light will come on and the car thinks the door is open. it is a 2000 ford mustang whitch has +12 when the door is closed and nothing when it opens, the remote starter needs to see -12 volts? if anyone has any idea let me know thanks.

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: December 30, 2004 at 12:27 AM / IP Logged

You want the Car to start when you open the door?

There are Issues to address.

The starter will keep going as long as the door is opened.

The starter will grind when you open the door if the car is running.

Or maybe I don't understand what you want.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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flyboy172152

Member - Posts: 3

Joined: December 27, 2004

Location: United States

Posted: December 30, 2004 at 11:26 AM / IP Logged

the remote car starter needs to see a -12volts in order to start the car remotly. so it needs to know if the door is open or close. on my car 2000 mustang it has a +12volts when the door is closed, so i was wondering how can i reverse the polarity of this wire? but it can not be hooked to a ground because it then bypass the door switch and tells the car that the door is open. the other thing is, i have treid this with a yellow and black wire, it shows 12 volts when closed and 0 volts when open is this the right wire for the door pin switch? on mustangs the swithch is part of the lock itself.

geepherder

Platinum - Posts: 3,668

This member consistently provides reliable information

Joined: October 27, 2003

Posted: December 31, 2004 at 9:35 PM / IP Logged

Yes, that's the right wire. Here's what you need to do. Connect that wire to one side of the coil (85 or 86). Connect the other side to a fused 12 volt constant. Now connect terminal 30 to ground, and 87a to your remote start.

The remote start will now see ground until a door is opened, and the NC contacts are broken.

My ex once told me I have a perfect face for radio.

flyboy172152

Member - Posts: 3

Joined: December 27, 2004

Location: United States

Posted: January 01, 2005 at 1:25 AM / IP Logged

thanks a bunch i will have to try that and see if it works

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using relays for door pins

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