key off, blinking light?

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Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=97718
Printed Date: July 15, 2025 at 7:55 AM

Topic: key off, blinking light?

Posted By: may03lt
Subject: key off, blinking light?
Date Posted: October 05, 2007 at 7:54 PM

Hey does anyone know how to wire-up an LED to blink when the key is off?

My friend doesn't have the money to sink into an alarm and this is what he wants. I figured if anybody has the knowledge to do it, its you guys!

BTW, I know its ghetto, you know its ghetto, and my boy knows its ghetto, lets not make a big deal out of it:D

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2003 Trailblazer LT
2007 Envoy SLT

Replies:

Posted By: i am an idiot
Date Posted: October 06, 2007 at 6:14 AM

Go to radio shack and purchase a 12Volt Flashing LED. Go to your local stereo shop and purchase a Bosch Relay. On the relay connect terminal 85 to ground. 86 to a switched power source. Terminal 30 to a Constant 12Volt source. Terminal 87A goes to the positive side of the LED. Ground the other side of the LED.

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