domelight supervision, 07 mustang
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=99031
Printed Date: June 28, 2025 at 4:07 AM
Topic: domelight supervision, 07 mustang
Posted By: 07mustanggt
Subject: domelight supervision, 07 mustang
Date Posted: November 15, 2007 at 10:04 AM
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.
Replies:
Posted By: BNLUIS
Date Posted: November 15, 2007 at 12:53 PM
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.
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Luis
Sound Waves
Is up to the installer to test all wires with a DMM whenever possible.
Posted By: KPierson
Date Posted: November 15, 2007 at 1:17 PM
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
Posted By: tedmond
Date Posted: November 15, 2007 at 2:14 PM
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.
Posted By: KPierson
Date Posted: November 15, 2007 at 3:06 PM
actually, Radioshack sells them for $7!!!!!!!!!!!!!!!!!!
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Kevin Pierson
Posted By: 07mustanggt
Date Posted: November 16, 2007 at 6:39 PM
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
Posted By: the12volt
Date Posted: November 16, 2007 at 6:42 PM
SPDT = single pole double throw, SPST = single pole single throw, https://www.the12volt.com/relays/relays.asp -------------  the12volt • Support the12volt.com
Posted By: 07mustanggt
Date Posted: November 16, 2007 at 6:47 PM
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?
Posted By: 07mustanggt
Date Posted: November 16, 2007 at 6:51 PM
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
Posted By: the12volt
Date Posted: November 16, 2007 at 6:54 PM
What is the year, make, model of vehicle and the make, model of alarm? ------------- the12volt • Support the12volt.com
Posted By: 07mustanggt
Date Posted: November 16, 2007 at 7:18 PM
What do you think is the year, make,model of my car? HINT: look at my username. Alarm was a python 990
Posted By: the12volt
Date Posted: November 16, 2007 at 7:28 PM
Never assume we know what year, make, and model vehicle you're working on when you create a topic, regardless of your user name. I for one failed ESP and flunked out of Crystal Ball twice. Alarm was a Python 990? What is it now? ------------- the12volt • Support the12volt.com
Posted By: 07mustanggt
Date Posted: November 16, 2007 at 9:32 PM
Its a 07 Ford Mustang Gt..thats the v8 in case you didn't know. I installed a Python 990 Alarm, Remote Start, Keyless entry System. I used a SPST relay for my Domelight Supervision. It only works 10% of the time. It is hooked up correctly. Should I just tag the - alarm dome super wire to the BLACK/ blue wire in the dome light holder, not sure of its polarity.
Posted By: 07mustanggt
Date Posted: November 17, 2007 at 1:20 PM
Well now it doesn't work at all. Heres how I have it hooked up. 86 to 12v, 85 to -BLACK/ white alarm dome super wire, 87 -lt.GREEN/ YELLOW car dome super wire, 30 to ground.
Relay makes all wires 12.5 volt.
I tested all the wires in the dome light bezel.
Lt.GREEN/ YELLOW Hit unlock(light off to on) 12v to 0v then to like 285v. Lock(light on to off) 285v to ov to 12v.
BLACK/ blue Hit Unlock(light off to on) 12.5v to 11.88v Lock 11.8v to 12.3v Hooking alarm wire directly to this doesn't work.
WHITE/ blue unlock 11v to 12v, lock 12v to 11v.
Pink/blue unlock 2.1v to 20v, Lock 20v to 2v.
Relay wires: armed car wire shows 12.5v to 12.2v.
unarmed 12.5v to 12.2v
Alarm wire Armed shows 12.5 to 11.6v
Unarmed 11.6v to 12.5v.
Lights don't turn on or off.
Any ideas Thanks
Posted By: techman93
Date Posted: November 17, 2007 at 11:36 PM
did you check the fuse for the interior illumination? It might have popped. Then make sure you have the correct wire hooked up. You can check directly at the dome light and test there. I have had one I had to hook up to the dome for supervision instead of tracking down the wire. On some others you can use the all door trigger if it lights the dome light.
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The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.
Do it right the first time... or I might have to fix it for ya
Posted By: 07mustanggt
Date Posted: November 18, 2007 at 7:39 PM
Well the fuse is still good. lights still turn on when door is opened or I use the factory key fob to unlock, lock the doors. It just doesn't work with my alarm key fob. The lt.GREEN/ YELLOW wire is the all door trigger-dome supervision. I even tried tagging it to the wire by the light, still does nothing.
One of the installers at work told me to cut the lt.GREEN/ YELLOW wire from the car and tie the remote line to it, so basically disconnecting it from the sjb. I might try this. Any other ideas?
Posted By: 07mustanggt
Date Posted: November 22, 2007 at 9:40 AM
Still not working. Any Ideas, this is the last thing I need to get working so I can put my car back together.
Posted By: Twelvoltz
Date Posted: November 22, 2007 at 10:04 AM
What are you using to test these circuits?
07mustanggt wrote:
Lt.GREEN/ YELLOW Hit unlock(light off to on) 12v to 0v then to like 285v. Lock(light on to off) 285v to ov to 12v.
285V? WTH?
If you are truly reading 285V then I would strongly suggest getting a better DMM and trying this again. This is a very basic circuit, not nearly as complicated as this thread is making it sound. If you ground the vehicle wire in question it should turn the dome light on, if your system is providing the negative output when unlocking (turning on the timed output for dome supervision), and the relay is wired as you stated
07mustanggt wrote:
86 to 12v, 85 to -BLACK/ white alarm dome super wire, 87 -lt.GREEN/ YELLOW car dome super wire, 30 to ground
then your relay is bad.
------------- Installer, IT support, and FFL. I need less hobbies.
Posted By: tedmond
Date Posted: November 22, 2007 at 2:23 PM
im sure the python has a dedicated light supervision output. Well thing is as u mentioned before "Lt.GREEN/ YELLOW Hit unlock(light off to on) 12v to 0v then to like 285v. Lock(light on to off) 285v to ov to 12v." if u getting 12 volts, then none to a SPIKE of 285volts, u better put a diode across the damn relay or ur gonna one day burn something. the diode protects the relay from causing a spike when it de energizes. Place white band towards postive side across terminal 85 and 86.
Posted By: 07mustanggt
Date Posted: November 23, 2007 at 3:39 PM
Well I just tested the relay by disconnecting the alarm dome wire from relay pin 85, and attaching a jumper and then grounding it. The relay clicked and made the dome lights turn on. So it works. So it has to be my alarm brain. For some reason it isn't sending a -signal threw the BLACK/ white dome alarm wire to the relay. Or is something else wrong? Any other wire...like accessory I can use instead?
Posted By: 07mustanggt
Date Posted: November 25, 2007 at 11:18 PM
Someone suggested I just take my -alarm dome super wire straight to my -door trigger wires. Would that work to make my dome supervision work?
Posted By: 07mustanggt
Date Posted: November 26, 2007 at 10:27 AM
Nevermind I just tried it and it didn't work. When I tested my alarm's dome super wire it only works part of the time, switching to ground. I started just touching it to wires and messed up my passenger doors auto down window. But owell. It's fun touching wires to see if I can get my dome supervision to work. I don't get why it would work with my ford remote but not with my python alarm? It seems simple enough, Maybe I just messed up some wires, like ground looped them or something. I've tried touching like every wire in my sjb. Is their a way to reset my car?
Posted By: peterubers
Date Posted: November 26, 2007 at 11:04 AM
check all your in-cabin fuses .. sounds like one of them may have blown during the fun of "touching wires to see if the dome supervision worked..." You have a sweet ride, '07 GT, i would hold back a little on the random testing of wires LOL ------------- The search function is your friend.
Posted By: 07mustanggt
Date Posted: November 26, 2007 at 11:26 AM
What setting do I put my dmm too, to test the fuses? Or should I just use a test light?
Posted By: 07mustanggt
Date Posted: November 26, 2007 at 12:07 PM
I just used a test light to test all of them. They all seem to be fine, with none blown. I just tried using a positive dome super and relay, but the dome super still doesn't work. At this point I think its the -BLACK/ white alarm dome super wire, not working properly. Is their another wire I can use from the alarm..python 990 to turn my domelights on and off?
Posted By: tedmond
Date Posted: November 26, 2007 at 2:21 PM
never use a test light. probably worst thing to do unless its a safe low voltage light. I suggest buying a crappy one for 10 bucks or 20. taht is more reliable than a light. as u mentioned, the viper unit probably has a messed up supervision out while u were "Testing wires by touching it around"
Posted By: peterubers
Date Posted: November 26, 2007 at 2:34 PM
you can use the disarm (-) and re-arm (-) output wires from the viper to trigger a latching relay system that when latched (i.e. disarmed/unlocked) will send 12 volts (+) fused to the Ford dome light wire .. then, when re-armed/locked, it'll kill the dome light. Yeah, you probably blew a transistor in the viper when testing -- no fixing it at this point. ------------- The search function is your friend.
Posted By: 07mustanggt
Date Posted: November 26, 2007 at 4:03 PM
Thanks guys. How should I hook up the relay for this? Or do I need to use two relays?
I tried it like this, but it didn't work. 86 to 12v, 85 to alarm disarm, 87 to ground, 30 to -car dome super wire. It turned the light on, but immediately shut off right after. With the rearm wire attached to 85 it didn't do anything. Any ideas?
Posted By: peterubers
Date Posted: November 27, 2007 at 5:48 PM
https://www.the12volt.com/relays/page5.asp#lsp------------- The search function is your friend.
Posted By: howie ll
Date Posted: November 27, 2007 at 6:49 PM
PR your inbox is full, regards Howard.
Posted By: 07mustanggt
Date Posted: November 27, 2007 at 8:06 PM
I fixed it. I just swapped out my brain with a new one. I guess I did fry something inside my old brain when I was touching wires around. oops! Owell its fixed now. Thanks for the help though.
Well today it stopped working again w.t.h. I just don't get, it works sometimes and other times it doesn't do anything. Do python alarms not have consistency with their dome super output wires?
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