How to wire flashing LED's

flanaia1 · 10-02-2009, 04:02 PM

Hi All

Need some advice on wiring flashing leds on my new work wagon. The Volvo unfortunately has a very poor visual deterent that it is alarmed just a puny led in the dash. My previous subaru had a dash mount led that reflected of the winscreen and the same in the rear panel reflecting off the rear screen.

There are loads of LEDs out there and a lot of them state there is no need to connect them to an alarm system you can wire them so they illuminate when the ignition goes off. My question is how? Presumably one of the wires is connected to a live that goes to ground when the ignition is off?

Could anyone suggest where I could tap into the wiring front and rear in order to wire an LED this way?

Thanks

Ted · 10-02-2009, 04:51 PM

Assuming your diode has the current limiting resistor built in (i.e. you can connect it sraight across 12v

Connect the anode to a permanent 12v supply, and the cathode to an ignition or accessory supply.

That way current will flow through the LED with ignition off, and no current will flow with ignition on.

Dieselman · 10-02-2009, 04:55 PM

Quote:

Originally Posted by flanaia1

Could anyone suggest where I could tap into the wiring front and rear in order to wire an LED this way?

Use a connection that is 12v +ve both sides with ignition on, when you switch off the load side will drop to Gnd via the circuit it feeds power to.

Another way would be to use the power supply to the existing LED as that will be alarm powered

Remember to fit current limiting resistors to stop the LED burning out.

10-02-2009, 04:02 PM	#1
flanaia1 Hardcore MB Enthusiast Join Date: Jun 2008 Location: Yorkshire Car: Mercedes CLK 230 Kompressor Sport Posts: 3,229	How to wire flashing LED's Hi All Need some advice on wiring flashing leds on my new work wagon. The Volvo unfortunately has a very poor visual deterent that it is alarmed just a puny led in the dash. My previous subaru had a dash mount led that reflected of the winscreen and the same in the rear panel reflecting off the rear screen. There are loads of LEDs out there and a lot of them state there is no need to connect them to an alarm system you can wire them so they illuminate when the ignition goes off. My question is how? Presumably one of the wires is connected to a live that goes to ground when the ignition is off? Could anyone suggest where I could tap into the wiring front and rear in order to wire an LED this way? Thanks __________________ "Dream as though you will live forever but live your life as if you will die today."

10-02-2009, 04:51 PM	#2
Ted Hardcore MB Enthusiast Join Date: Feb 2004 Location: Warwick Car: clk 320, E220 W124, slk 200, Yamaha XVS 1100 Posts: 1,313	Assuming your diode has the current limiting resistor built in (i.e. you can connect it sraight across 12v Connect the anode to a permanent 12v supply, and the cathode to an ignition or accessory supply. That way current will flow through the LED with ignition off, and no current will flow with ignition on.

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