how to make led go off when engine starts

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3square

Member - Posts: 3

Joined: November 15, 2006

Posted: November 15, 2006 at 10:16 PM / IP Logged

basicly i want to make a fake alarm status light

so the led would go on when i turn off the engine, and would turn off when i start the engine.

i set it up before but forgot which fuse i tapped into.

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KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: November 16, 2006 at 5:21 PM / IP Logged

Hook the + side of the LED up to the main 12vdc wire in the car. Hook the (-) side up to the main ignition wire in the car. Make sure you are using a flashing 12vdc LED or it won't work (for very long).

Kevin Pierson

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3square

Member - Posts: 3

Joined: November 15, 2006

Posted: November 17, 2006 at 4:04 AM / IP Logged

thanks for the reply.

i'm using a running led bar about 8 leds

it should be fine?

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master5

Silver - Posts: 1,123

Joined: October 10, 2006

Location: United States

Posted: November 17, 2006 at 11:14 AM / IP Logged

Yes it should be fine. If the running bar you are using has 3 wires the 3rd is to turn it on during a negative signal.

What you will do is connect red to 12v positive, black to ground, and the 3rd wire to ignition. What happens is (like the above post) is when the ignition if off the wire will send a neg. to the led bar and it will operate, when the key is on that wire turns 12v+ and the led's turn off. No prob.

If only a 2 wire (flashing) unit designed for 12v it will wire as KPierson above posted.

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how to make led go off when engine starts

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