Ignition Wire (grounded when ignition is off)?? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 11 (permalink) Old 05-21-2010, 09:14 AM Thread Starter
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Ignition Wire (grounded when ignition is off)??

I'm considering installing a Varad flashing alarm LED that I had laying around as a spare and I don't have an alarm system installed on my Commander. I honestly do not want to install an alarm system and I figured the flashing alarm LED would at least serve as a theft deterrent. The LED can be installed without an alarm system and has 3 wires to do this: one goes to constant 12V source, another one goes to ground, and the last one goes to the ignition wire which is "grounded when the engine is off". Does anyone know where I can find this wire, preferrably somewhere in the interior as opposed to going to the PDC or IPM? Has anyone installed one of these in their Commander without an alarm system? Thanks for any help I can get.

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Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights


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post #2 of 11 (permalink) Old 05-21-2010, 12:18 PM
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one of the 12v " cigarette lighter " plugs is on the ignition switch, maybe tap into that ?

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post #3 of 11 (permalink) Old 05-21-2010, 03:36 PM Thread Starter
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You know, I actually did think about that but what confuses me is that the instructions says that it needs an ignition wire that is "grounded when the engine is off". The 12V cigarette lighter wire is a power source that is cut off when the engine is off, is that what they would mean by "grounded" when off? I guess only one way to find out.

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Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights


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post #4 of 11 (permalink) Old 05-21-2010, 04:42 PM
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Those security leds need to have that line grounded to activate the led which gets constant power, easy when with a alarm, tougher when wiring it standalone, you don't want to tie that line to the 12V cigarette lighter which is switched, it won't work, and if you tie it to the ground it will always be on.

Does it have the standard red, yellow, black wires? Yellow being the tie to ground to activate? You could easily do it with a little 12V relay with Normally Closed contacts and power it off the lighter plug, excuse the 10 second paint sketch lol.

Doh! too quick to think, you'd power the relay from the switching cigarette lighter power, the led would have to be powered from constant 12V... fixed the sketch...
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Last edited by SoundDoc; 05-21-2010 at 04:46 PM.
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post #5 of 11 (permalink) Old 05-22-2010, 04:56 PM Thread Starter
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Thanks SoundDoc! I think I understand. What type of relay would that be called and how many amps? The only thing I found at my local Radio Shack is a 30amp SPDT relay, would that work?

According to your diagram I was thinking the following:
- ground to relay and LED
- constant power (from unswitched power outlet) to LED
- switched power (from switched lighter) to relay (to which pin?)
- relay out (which pin?) to grounded when engine off wire of LED

Relays have more pins, would they not all be used for this little project? This is turning out more complicated than I thought lol. You were right that it would be easier to install on an alarm system.

Thanks for the help!

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Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights


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post #6 of 11 (permalink) Old 05-22-2010, 05:08 PM
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Why not just connect it to you power/ground and have it on all the time? Seems easier.
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post #7 of 11 (permalink) Old 05-22-2010, 05:13 PM
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I was thinking the same thing. An LED does not draw very much current.

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post #8 of 11 (permalink) Old 05-22-2010, 06:08 PM Thread Starter
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I did consider putting a switch instead of having it on all the time but I'd rather have it turn on and off on it's own. I'm doing more research on using a relay since I understand the concept but never really used one on a custom install, it might be worth trying to figure it out.

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Mods: AFE Magnum Force Stage 2 CAI, OME HD Lift w/OME Shocks and Struts, Goodyear Wrangler All Terrains w/Kevlar 255/70R17, JBA Gen 6.7 Upper Control Arms, Hypertech Speedo Calibrator, Magnaflow cat-back system, Custom Retrofit HID Projectors, LED Conversion Kit for Fog Lights, Rigid Industries D2 LED Driving Lights


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post #9 of 11 (permalink) Old 05-22-2010, 06:18 PM Thread Starter
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SoundDoc- This is the relay I found, is it the correct one? From the attached diagram, which wires would go on what pins (ie ground, constant, switched, to LED, etc.)?

Thanks!
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post #10 of 11 (permalink) Old 05-24-2010, 07:46 AM
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Try the switched ignition line before going nuts with finding a small enough relay to do the job. The LED takes in the neighborhood of 10mA and the switched ignition line should be "grounded enough" with everything that powers up when the ignition is on to power the LED with the ignition off.
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