Help with Fake Alarm LED

Hi guys, i just bought a Viper 620V LED. Its 12V, has just 2 wires. I want to connect it to my 2009 nissan versa, to use it as a fake alarm led. I want to mount it on the drivers side lower windscreen.
Could someone tell me exactly how to do the wiring. I read online that I can add some wire to draw a 12V constant current from the +battery terminal, and then wire the other wire to the ignition. I dont want to add any switches or anything, just plain it flashes when the car is off and stops when i turn the car on. Would this work?

All help is really appreciated, thanks!

Does the LED flash automatically when connected to 12 volts ???

Why not just use a relay and hook the ground to the 87a normally closed, then use the ignition as the trigger? I think that is what you are after.

Most Alarm LED's use the brain to flash them thats why I ask ...

Hi, the LED flashes normally when connected to 12V. I dont have an alarm, just this light.
Spawn- What is an 87a?

Thanks for all the help!

A relay the 87a is the normally closed terminal connect the - lead of the LED to it then ground the other terminal (30?) , you'd wire the coil to the ignition and a ground
When the ignitions on it opens the normally closed contact (no light)
Ignition off terminal closes (lights on)

Can I connect the black wire to 12V directly at the positive battery terminal and the red wire to the ignition 1 (positive wire). The LED wire itself has a built in resistor/relay not really sure, its a cude about 1cmX1cm. Would this work?

nissanversa wrote:

Can I connect the black wire to 12V directly at the positive battery terminal and the red wire to the ignition 1 (positive wire). The LED wire itself has a built in resistor/relay not really sure, its a cude about 1cmX1cm. Would this work?

You can buy blinking LED lights, connect (+) of the LED to battery power and connect the (-) leg of the LED to ignition power. When the key is on, both lead to the LED have (+) power going to them, so no light. When the ignition is off, the LED grounds through the ignition circuit and the LED will blink.

No relay needed if you use a blinking LED like this, but be sure the LED can handle 15 volts as the ones I use need a resistor to limit the voltage to 5-10 volts.

http://www.superbrightleds.com/specs/brb2020_specs.htm

nissanversa wrote:

Can I connect the black wire to 12V directly at the positive battery terminal and the red wire to the ignition 1 (positive wire). The LED wire itself has a built in resistor/relay not really sure, its a cude about 1cmX1cm. Would this work?

NO ...

He stated the LED he has blinks when conected to 12volts

So im getting mixed answers. If I connect one wire to positive battery terminal, other one to Ignition 1 (Red +), the car is an 2009 Nissan versa. Led only has 2 wires, black and red. Its 12V and it blinks when connected to 12V.
Thanks for the help guys!

NO ... Just cause it's ignition and it's off it doesn't go to ground ... You need the relay wired the way I listed

bad venge wrote:

NO ... Just cause it's ignition and it's off it doesn't go to ground ... You need the relay wired the way I listed

In my truck (2002 GMC)... the ignition power is a (-) when key is off and (+) when key is on...

http://www.nifty-stuff.com/car-alarm.php

It doesn't matter what your ignition is wired as, the easiest way to accomplish this is to wire the relay as bad venge and i suggested, and for the trigger wire get one of those add-a-circuit mini fuses



Find a fuse that is engaged when you start the car (I use the fuse for the cig lighters in the cabin) and hook that to the 85 pin on the relay, and ground the 86 pin. Thanks to the12volt.com for the image



So here is your wiring for your application.

LED:
Black to ground
Red to pin 87a on the Relay

RELAY
30 - Positive 12V constant
85 - Wire from Add-a-Circuit
86 - Ground
87a - Red to LED
87 - not connected (unless you have some thing else you want to turn on with the ignition, then you just saved yourself some more wiring)

Another possible option instead of using the add-a-circuit, is to use the amp remote wire from your head unit. Hook that to the 85 pin as the trigger, but be aware that it will obviously only work if the stereo is on.

Spawn wrote:

It doesn't matter what your ignition is wired as, the easiest way to accomplish this is to wire the relay as bad venge and i suggested, and for the trigger wire get one of those add-a-circuit mini fuses

Here is a web site explaining how the led can ground through the ignition switch or any fuse that is switched power.

http://jasonandginny.com/OurWebsite/civicalarm.html

The 12 volt blinking LED and a short piece of wire is all you need to make a fake car alarm.