Flashing LED w/ignition off

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=38105
Printed Date: July 15, 2025 at 7:27 PM

Topic: Flashing LED w/ignition off

Posted By: Bearington
Subject: Flashing LED w/ignition off
Date Posted: August 25, 2004 at 9:06 PM

No alarm system. I have a flashing LED but I only want it to flash when the vehicle is off. How can I get 12v power with the key off and cut out when the key is on?

Thanks

Replies:

Posted By: auex
Date Posted: August 25, 2004 at 9:18 PM

Power goes to constant power and ground will go to the ignition wire.

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Posted By: dBDevil
Date Posted: August 25, 2004 at 10:40 PM

That won't make it flash thought, that is if you're just hooking up an LED by itself. I would go with an LED scanner of sorts, perhaps from Varad, DEI, etc. auex is right in saying you'd just use the 12volt and the ignition wire for ground.

Posted By: draasch
Date Posted: August 25, 2004 at 10:50 PM

[QUOTE=Bearington]

No alarm system. I have a flashing LED

do like auex said to do it....

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Posted By: delphidoc
Date Posted: August 26, 2004 at 9:03 AM

Use a Bosch SPDT relay and a flashing LED:

85: ignition source

86: body ground

30: 12VDC+

87a: LED

87: (not used)

This way the path to the LED is interrupted when the ignition switch is not in the OFF position. This will draw current when the ignition is off, but only as much as the relay's coil pulls.

Here's an example of a flashing (blinking) LED: https://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F011%5F006%5F002%5F000&product%5fid=276%2D036

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Posted By: delphidoc
Date Posted: August 26, 2004 at 9:04 AM

My bad. You already have a flashing LED.

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Posted By: Chromic-Chris
Date Posted: September 01, 2004 at 12:05 PM

Car alarm/Remote start relays will be 12v SPDT's, but what amp ratings are typically used for most extraneous features? (ie LED's, window rollup, rear defrost, front fan, heated seat activation, radar, motion sense).