Wiring for a fake alarm led

stoop · Dec 15, 2008

I am going to install one of those flashing led's so it looks like the truck has an alarm. Does anyone know where to find 12 volts that is only powered when the truck is off? If not I know how to use relays in order to make it work, just looking for the easy road!

Wicked_Sludge · Dec 15, 2008

why not just hook it to a 12volt constant? will it hurt if it flashes while your driving?

MAKG · Dec 15, 2008

There is no voltage source that is only active when off. However, perhaps you can find and install a normally-closed relay.

Or maybe buy something that isn't a flaming POS. Negative logic isn't hard to figure out and if its THAT badly engineered, do you really want to put it in your electrical system?

I doubt a flashing LED is going to fool anyone. No one pays attention to alarms. Everyone knows that.

daniel3507 · Dec 15, 2008

my brother got one for his jeep and decided he didnt want it. i got bored and decided to put it in my truck. took it out the next day. they get really annoying when driving at night so i wouldnt recommend them

RobbieD · Dec 15, 2008

Very simple connections to do this. Get a 12 volt flashing LED (Radio Shack carries them; get one with preinstalled wire leads). Connect the LED's (+) lead to constant (+) 12 volts; connect the LED's (-) lead to switched 12 volts (either ignition or accessory). Both connections can be made at the fusebox. The LED will flash when the ignition is off, and not flash when the ignition is on. Make sure that you get the 12 volt flashing LED, not a 5 volt.

MAKG · Dec 15, 2008

And DO NOT GROUND the LED. You won't like the results.

Ignition off doesn't necessarily ground the ignition lead, but it often does.

And make DANG sure there is some resistance in that circuit or you'll short your ignition to ground.

Wiring for a fake alarm led

stoop

10+ Year Member

Wicked_Sludge

15+ Year Member

MAKG

15+ Year Member

daniel3507

15+ Year Member

RobbieD

Certified Old Bag Of Dirt

MAKG

15+ Year Member

Sponsored Ad

TRS Events & Gatherings

Latest posts

Featured Rangers

TRS Latest Video

Official TRS Merchandise

Follow TRS On Instagram

Latest Album Photos

Product Suggestions