LED Question - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 2 Old 04-01-2012, 06:46 PM Thread Starter
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LED Question

Hey everyone, so im new to electrical work and i have a few questions about how to set up some exterior leds. So this is the idea i have in mind-
I would like to put some led strips right behind my grill(like the oracle kits do it) and set them up so that they only come on when i unlock my car...
ive been researching this everywhere and keep comming to the problem that if i connect them to the dome light wiring then they will also turn on when i manually turn on my dome light.
How or even can this be done?
Please if someone could point me in the right direction?

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post #2 of 2 Old 04-23-2012, 03:59 PM
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You could use something like a relay to kill the circuit to the LEDs when you manually turn on the dome light.

I drew a cheesy picture. Red wires represent power wires that are already there. Blue wires represent power wires you add for the LEDs. You also need to add the relay, and you need to add the diode between the dome light and the manual dome light switch on the car's existing power wire to allow power to flow from the switch to the dome, but never from the dome to the switch.

The power you tap from the dome goes through a relay on the "normally closed" poles (make sure your relay has these poles, not all of them do), which will be connected together when the relay is *not* energized. The relay will be energized only by the manual switch, not by unlocking the door because of the diode. When the relay is energized, the power to the LEDs is cut off.

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