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.
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.
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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
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.
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.
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My ex once told me I have a perfect face for radio.