domelight supervision, 07 mustang

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07mustanggt

Copper - Posts: 89

Joined: October 02, 2007

Posted: November 15, 2007 at 10:04 AM / IP Logged

I used a relay for my dome supervision on my alarm. It only works like 25% of the time. Just wondering if they go bad or don't work all the time.

Bnluis

Silver - Posts: 578

Joined: December 24, 2002

Location: New York, United States

Posted: November 15, 2007 at 12:53 PM / IP Logged

Well it could also be tthat he output on the alarm is not triggering the relay , hard to say unless you test it when is not working.

Luis

Sound Waves

Is up to the installer to test all wires with a DMM whenever possible.

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: November 15, 2007 at 1:17 PM / IP Logged

Yes, relays can go bad, and they can go bad in a variety of different ways. They are an electromechanical device and can fail electronically (shorted or open coil) and mechanically (worn contacts, broken contacts, welded contacts, etc.)

However, usually when they fail they fail, they don't intermittently work. I would venture to say the problem is with whatever is controlling the relay. You could test this easily by hooking up an LED in parallel with the relay coil. When the dome light isn't on the LED shouldn't be on.

Or, you could just replace the relay just to confirm it isn't the problem, they are only a few bucks.

Kevin Pierson

tedmond

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Joined: January 06, 2007

Location: Ontario, Canada

Posted: November 15, 2007 at 2:14 PM / IP Logged

about a dollar or so for realys. max is like 5. Well if i was you, i would see where they put the dome light trigger relay. take a DMM connect to cosntant 12v and test the dome light output to see if it sends a ground out when u unlock by controll.

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: November 15, 2007 at 3:06 PM / IP Logged

actually, Radioshack sells them for $7!!!!!!!!!!!!!!!!!!

Kevin Pierson

07mustanggt

Copper - Posts: 89

Joined: October 02, 2007

Posted: November 16, 2007 at 6:39 PM / IP Logged

Whats the difference between a spdt and spst? I got a relay for my dome light supervision. It only has 4 prongs, I think its a spst(but not sure). It only works like 10% of the time. Did I use the wrong relay

the12volt

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: November 16, 2007 at 6:42 PM / IP Logged

SPDT = single pole double throw, SPST = single pole single throw, https://www.the12volt.com/relays/relays.asp

domelight supervision, 07 mustang -- posted image.

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07mustanggt

Copper - Posts: 89

Joined: October 02, 2007

Posted: November 16, 2007 at 6:47 PM / IP Logged

Ok So I still think I have a spst since it only has 4 prongs and not 5. Any ideas why the dome lights don't turn off when I arm my alarm or turn on when I hit disarm?

07mustanggt

Copper - Posts: 89

Joined: October 02, 2007

Posted: November 16, 2007 at 6:51 PM / IP Logged

Ya I got my relay at radioshack for $7. I will try replacing it, and if that doesn't work I will test it. Thanks

the12volt

Administrator - Posts: 3,955

Joined: March 07, 2002

Location: Louisiana, United States

Posted: November 16, 2007 at 6:54 PM / IP Logged

What is the year, make, model of vehicle and the make, model of alarm?

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