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Looking For A Ground When Ignition Is Off?


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dsincolorado 
Member - Posts: 2
Member spacespace
Joined: May†14, 2023
Location: Colorado, United States
Posted: May†14, 2023 at 6:11 PM / IP Logged Link to Post Post Reply Quote dsincolorado
Hi everyone, hoping you guys might be able to help a newbie. Iím trying to install a simple flashing LED but need it to be powered only when ignition is off. In my Xterra Iíve found plenty of hot wires, but so far cannot find a wire that is grounded ONLY when the ignition is off.
Any help would be sincerely appreciated.
Thanks, DS in Colorado
2005 Nissan Xterra
i am an idiot 
Platinum - Posts: 13,621
Platinum spaceThis member consistently provides reliable informationspace
Joined: September†21, 2006
Location: Louisiana, United States
Posted: May†14, 2023 at 7:14 PM / IP Logged Link to Post Post Reply Quote i am an idiot
Connect the positive LED wire to constant 12 v. Connect the negative LED wire to an ignition wire.
Or, use a relay. Ground to 85 and 30. Ignition to 86. 87A will be ground when ignition is off.
Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB
davep. 
Gold - Posts: 636
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Joined: May†27, 2011
Location: California, United States
Posted: May†18, 2023 at 12:39 PM / IP Logged Link to Post Post Reply Quote davep.
IAAI, I took the liberty to make it a little clearer.
I've used this method numerous times, and it works, but there can be a catch. If you loose the power on the "HOT" side, the reverse current limit of the LED will be exceeded, and the LED will be destroyed. I now put a 1-amp diode in series with the LED in its forward direction to protect it against loss of B+.
dsincolorado 
Member - Posts: 2
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Joined: May†14, 2023
Location: Colorado, United States
Posted: May†18, 2023 at 1:08 PM / IP Logged Link to Post Post Reply Quote dsincolorado
Great tip, I'm going to poke around the ignition wires this weekend. I'll let you know!    
Thanks, Dan

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