Flashing led Alarm

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=66002
Printed Date: July 16, 2025 at 6:57 AM

Topic: Flashing led Alarm

Posted By: llomens
Subject: Flashing led Alarm
Date Posted: November 10, 2005 at 1:48 PM

I'm wondering how to wire up a simulated alarm led...

It should be flashing when the relay is closed...
I'm thinking it has to be connected to both the constant 12v of the battery and the accesory 12v... but can't figure it out.

Replies:

Posted By: redpeppers
Date Posted: November 11, 2005 at 12:09 AM

they sell LED's that flash on there own.....they prolly no more than a dollar.....then all u need is a 1k ohm resistor and some wire and boom.

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Where theres is a wire there's a way.

Posted By: llomens
Date Posted: November 13, 2005 at 9:27 PM

I have the led I need to know how o wire up the relay so it turs on when the car is off only,

Posted By: KPierson
Date Posted: November 13, 2005 at 9:51 PM

A lot of ignition systems will rest at ground. So, if you hook up the LEDs positive side to 12vdc and the negative side to the ignition wire it may flash when you shut the car off. You may also need a resistor, depending on the LED.

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Kevin Pierson

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