relay to convert polarity

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prdjr165

Copper - Posts: 293

Joined: October 31, 2002

Location: Illinois, United States

Posted: January 25, 2008 at 7:21 AM / IP Logged

I need help with a doorpin wire,i need to trigger(-)an input wire on a GPS unit,The problem i am having is the doorpin wire rest's at ground and then changes to (+) when the door opens.i tried this set-up..85.and 87. to ground...86.(+) from door trigger wire when opened...30. to GPS input.With this set-up the dome light didn't workafter you opened the door one time,the relay was being held in,when i removed the wire from pin 86 the dome would come on.

Twelvoltz

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Joined: March 24, 2005

Location: New Jersey, United States

Posted: January 25, 2008 at 8:29 AM / IP Logged

Make/Model/Year of car please.

Installer, IT support, and FFL. I need less hobbies.

prdjr165

Copper - Posts: 293

Joined: October 31, 2002

Location: Illinois, United States

Posted: January 25, 2008 at 9:23 AM / IP Logged

it's a 2008 F450 and a 1999 F450 tow truck.

mobile1

Silver - Posts: 479

Joined: February 23, 2004

Location: United States

Posted: January 25, 2008 at 10:01 AM / IP Logged

85 = 12v+

86 = door pin

87a = ground

30 = input to GPS

Or you can use domelight wire in the truck. The domelight should be a positive trigger (rest at ground go to 12v+ with door open) you can use a relay to change the polarity on this. If I remember right, it should be BLACK/ blue in either the pass kick or the driver A pillar.

prdjr165

Copper - Posts: 293

Joined: October 31, 2002

Location: Illinois, United States

Posted: January 25, 2008 at 10:22 AM / IP Logged

Thanks for the reply,I have it hooked to the dome wire now but that's not a true indicator,the driver can turn on the dome with the switch on the dash and this would register on the GPS as an open door.Your relay set-up looks like it will work,I will give it a try.

audioman2007

Copper - Posts: 580

Joined: February 20, 2007

Location: United States

Posted: January 25, 2008 at 12:39 PM / IP Logged

there is something I want to do with my alarm that fits perfectly in this topic. Since I have a cavalier, I use the (-) door trigger inputs on my alarm. I want to install some more sensors but I dont want to diode the trigger wire into the shock sensor (which came with the alarm and has a port to plug it into the brain). Instead I want to use the (+) door trigger wire. Is there a way to do this?

tedmond

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Joined: January 06, 2007

Location: Ontario, Canada

Posted: January 25, 2008 at 6:27 PM / IP Logged

using both neg and pos triggers at the same time isnt too smart. It might fry and damage the unit if both triggers were set off.

audioman2007

Copper - Posts: 580

Joined: February 20, 2007

Location: United States

Posted: January 25, 2008 at 7:57 PM / IP Logged

So then I should just tie each trigger to the negative door trigger? I will need to diode each sensor that goes to that door trigger plus diode door trigger side of the negative door trigger. The way I have my door trigger inputs wired is I have the wire ran to my dome light wire since opening any door turns the domelight on.

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relay to convert polarity

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