How to get 12volts when key is off only?

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Bearington

Member - Posts: 9

Joined: November 11, 2003

Location: Canada

Posted: August 25, 2004 at 9:11 PM / IP Logged

No alarm system. I need to power up my snazy LED but I dont want it to flash when I'm driving.

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Bearington

Member - Posts: 9

Joined: November 11, 2003

Location: Canada

Posted: August 25, 2004 at 9:15 PM / IP Logged

Oops wrong forum, sorry

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backinblack_gp

Member - Posts: 21

Joined: March 07, 2004

Location: United States

Posted: September 07, 2004 at 8:40 PM / IP Logged

Use the normally closed contacts of a double-throw relay to supply power to your LED. Drive the relay coil with the accessory circuit.

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shldofbenacwboy

Member - Posts: 4

Joined: August 26, 2004

Location: United States

Posted: September 07, 2004 at 8:51 PM / IP Logged

run 12volt constant to your led's constant lead, and attach the ground side of the led to your car's true ignition which will read ground untill you turn on the key in most vehicles, thus turning the led off when the igition key switch is on. be sure to fuse as needed.

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backinblack_gp

Member - Posts: 21

Joined: March 07, 2004

Location: United States

Posted: September 14, 2004 at 8:38 PM / IP Logged

*MOST* automotive ignition (+) feeds will only go open when not active. They will not go to ground when inactive. Open circuits do not light LEDs...

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Ravendarat

Platinum - Posts: 2,806

Joined: February 23, 2004

Location: Canada

Posted: September 14, 2004 at 11:21 PM / IP Logged

Hooking the ground up to the main ignition wire in the main harness will work 99.9 percent of the time. Quick and easy, no problems

double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

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Bearington

Member - Posts: 9

Joined: November 11, 2003

Location: Canada

Posted: September 15, 2004 at 6:44 AM / IP Logged

Great. Thanks for the replies guys

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How to get 12volts when key is off only?

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