blinking LED's on when truck is off?

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pfitz

Copper - Posts: 53

Joined: May 10, 2003

Location: Canada

Posted: December 02, 2004 at 11:05 AM / IP Logged

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?

blinking LED's on when truck is off? -- posted image.

A little help please!

Thanks

the12volt

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: December 02, 2004 at 11:22 AM / IP Logged

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).

blinking LED's on when truck is off? -- posted image.

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ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: December 03, 2004 at 4:33 PM / IP Logged

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

diabloscope

Member - Posts: 48

Joined: August 16, 2004

Location: United States

Posted: December 07, 2004 at 3:05 AM / IP Logged

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

diabloscope

Member - Posts: 48

Joined: August 16, 2004

Location: United States

Posted: December 07, 2004 at 3:07 AM / IP Logged

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.

jaxon23

Member - Posts: 25

Joined: May 19, 2004

Posted: December 07, 2004 at 8:12 AM / IP Logged

but he wants it to blink like an alarm LED not just burn steady

ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: December 07, 2004 at 8:30 AM / IP Logged

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.

pfitz

Copper - Posts: 53

Joined: May 10, 2003

Location: Canada

Posted: December 07, 2004 at 10:56 AM / IP Logged

OK, it is a 1992 Toyota 4X4 truck, what color is the wire and where would I find it?

ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: December 07, 2004 at 11:26 AM / IP Logged

This sites info

Accessory to terminal 86

Constant 12v to terminal 30

LED anode to terminal 87a

Ground to terminal 85

diabloscope

Member - Posts: 48

Joined: August 16, 2004

Location: United States

Posted: December 08, 2004 at 1:54 AM / IP Logged

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,

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