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leds turn on when ignition goes off?


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sandantos 
Member - Posts: 1
Member spacespace
Joined: February 14, 2008
Location: Ontario, Canada
Posted: February 14, 2008 at 8:25 PM / IP Logged  

I was hoping to get my door handle leds to turn on when my car turns off. I've read through a few posts, they basiclly say:

Connect one side  to constant (cigarette lighter), and the other to a switched power source . My questions are:

1- So do i splice the + wire of my cigarette lighter and connect it to the + end  of the led?

2-Are switched power sources anything that only turns on when the car is on (sunroof, etc.)? 

If so, what do I connect the - end of the led to? The positive of the sunroof, or the negative? Any help would be much appreciated, crude diagrams are not only welcome, but encouraged.Thanks a bunch.

leds turn on when ignition goes off? -- posted image.

ice32 
Copper - Posts: 116
Copper spacespace
Joined: June 12, 2007
Location: Australia
Posted: February 15, 2008 at 8:51 AM / IP Logged  
leds turn on when ignition goes off? -- posted image.
Here is the relay wiring only. you still need the required resistance for the leds your using, put them in after the relay on pin 30.
remember that if you use a 12v straight from the battery and wire up your relay like above, it WILL DRAIN YOUR BATTERY if you leave your car off for a long period of time. e.g over night or shorter depending on the draw of the leds.
you might want to rethink or add your thoughts to your post now that you no that. e.g when do you want them to turn off after that car is off?
p.s the middle pin of that relay is 87a if you can't read it in the image.
Big Dog 
Gold - Posts: 1,265
Gold spaceThis member consistently provides reliable informationspace
Joined: May 02, 2002
Location: Quebec, Canada
Posted: February 15, 2008 at 11:21 AM / IP Logged  

Assuming you have 12 volt LEDs:

Connect the anode to B+ (if it has presoldered wires then this is usually red).

Connect the cathode to ignition (if it has presoldered wired this is usually black).

No relays required.

No diodes required . . . this is what a LED is.

The instant ignition is turned off, the LED lights up.

Keep booster cables in the trunk....you'll need them if you don't start your car for a few days. leds turn on when ignition goes off? -- posted image.

Prepare your future. It wasn't the lack of stones that killed the stone age.
Chris Luongo 
Platinum - Posts: 3,746
Platinum spaceThis member consistently provides reliable informationspace
Joined: May 21, 2002
Location: Massachusetts, United States
Posted: February 27, 2008 at 9:09 AM / IP Logged  
Does your car have a feature from the factory that turns on the domelight when you shut the car off? If so, you could just wire the LEDs in with the domelight.

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