blinking LED's on when truck is off?
Printed From: the12volt.com
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=44282
Printed Date: June 14, 2024 at 4:09 AM
Topic: blinking LED's on when truck is off?
Posted By: pfitz
Subject: blinking LED's on when truck is off?
Date Posted: December 02, 2004 at 11:05 AM
I have one of those Radio Shack blinking LED's. I want it to come on when the truck is OFF and to shut off when the ignition is ON. I know this is a simple procedure, but I just can't wrap my brain around it? :oops: A little help please! Thanks
Replies:
Posted By: the12volt
Date Posted: December 02, 2004 at 11:22 AM
Connect terminal 85 of an SPDT relay to ground, terminal 86 to ignition, terminal 30 to LED(s) positive, terminal 87a to constant 12V positive. When the ignition is on, the normally closed terminals of the relay will open, turning off the LED(s). Depending on the LED(s) you have, you may need to add resisitors to the LED(s). -------------  the12volt • Support the12volt.com
Posted By: ff-mike
Date Posted: December 03, 2004 at 4:33 PM
I would do almost the same thing as the12volt except I would switch the LED positive to #87a terminal and connect #30 to the supply (constant 12v). This way you could use #87 as a feeder for a circuit that you only want when the ignition is on- ie a steady green LED to let the signficant other that the car is already on or to feed amps or something similiar
Posted By: diabloscope
Date Posted: December 07, 2004 at 3:05 AM
even easier way and still as safe . the positve side L.E.D. to constant , and the Neg side of L.E.D. to true Ignition. true ingition rests at ground
Posted By: diabloscope
Date Posted: December 07, 2004 at 3:07 AM
even easier way and still as safe . the positve side L.E.D. to constant , and the Neg side of L.E.D. to true Ignition. true ingition rests at ground , thats what you asked for when the key is off the L.E.D. turns on , and off when key is on.
Posted By: jaxon23
Date Posted: December 07, 2004 at 8:12 AM
but he wants it to blink like an alarm LED not just burn steady
Posted By: ff-mike
Date Posted: December 07, 2004 at 8:30 AM
This is a blinking LED out of the box. So it will blink with constant 12v. AFAIK, ignition has no connection at ground, so the option from 12v to ignition would be invalid.
Posted By: pfitz
Date Posted: December 07, 2004 at 10:56 AM
OK, it is a 1992 Toyota 4X4 truck, what color is the wire and where would I find it?
Posted By: ff-mike
Date Posted: December 07, 2004 at 11:26 AM
This sites info
Accessory to terminal 86
Constant 12v to terminal 30
LED anode to terminal 87a
Ground to terminal 85
Posted By: diabloscope
Date Posted: December 08, 2004 at 1:54 AM
yes all cars true ignition rests at ground and for your car is black wire w/ yellow stripe , in the main ignition harness constant is a white wire in the same loom,
Posted By: diabloscope
Date Posted: December 08, 2004 at 1:59 AM
again neg - side of l.e.d to ( ignition ) and the pos + to (Constant ) it WILL work ! !
Posted By: pfitz
Date Posted: December 08, 2004 at 10:44 AM
OK, diabloscope, I will give it a try and let you know how it works. Thanks!
Posted By: AAAUDIOWAVES
Date Posted: December 12, 2004 at 12:46 AM
I gotta go with Diablo on this one
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AA Audio Waves
Wildomar CA
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