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Old 05-19-2008, 03:15 PM   #1
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LED Vents Help

Hello,

I want to light my vents up with leds, I read the how-to, however, Im just trying to figure out the wiring.

I'm pretty retarded when it comes to wiring, so...this was my "plan"

I want to light up all 4 vents, with 4 LEDs. So I would need...

4 LEDs
a Drill and Bit
Silver/chrome paint or foil

Butt connectors
Wiring(What gauge thou?)
a fuse(one of those that prevents fires or shortages..I think..)

I want to wire all of my LEDs to my Fog Light switch, since I dont have fog lights, however the switch still pops out.. so I'm assuming I still have fog light capability.

So, Here is what I was going to do..

Run a + wire from the fog light fuse, to that other fuse(don't know its name..), then run the lead from that to the + wire coming from my first LED, then keep going across the dash connecting the red(+) wires together and then connecting the black(-) ground wires together. Leaving me with a black (-) ground wire at the very end, at which I can ground to a bolt or something.

Would this work? or am I completely stupid and don't know what the f I'm doing... lol

Any help would be sweet, thanks!


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Old 05-19-2008, 03:27 PM   #2
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you would be better off adding a switch imo but the foglight switch would work if you did the foglight mod.

you will have to do the foglight mod to allow you to have the vent lights on when your headlights are on, basically remove the relay and put a wire in its place, search for the how-to

also, you really only need one fuse, the foglight fuse alone will work fine

your progression of wiring is incorrect... heres an attempt at helping

"ground" and "+12V" are reference points, like going from "your house" to "work"

you use "2 gallons" of "gas" to get to work

generally, electricity uses "3.4 volts" of "energy per unit charge" to get across an LED. Also (and this only applies to LED's and a few other things), electricity can only flow in one direction across an LED

so basically, you need a +12V source (foglight fuse, which is somehow connected to the + terminal of the car's battery) and a ground reference location (the metal of the dashboard frame works fine here, since the frame is grounded to the - terminal of your car's battery)

LED's have a long and a short "lead" where electricity goes in and out. Generally the long lead is the "+" lead and the "-" lead is the short one. LED's are also very fragile; you need a small resistor to help them handle power surges and such. a 100-500 ohm resistor will work fine. here is how I would do it

fuse->resistor->(+lead,LED,-lead)->(+lead,LED,-lead)->(+lead,LED,-lead)->(+lead,LED,-lead)->ground

so, as you see, you hook up the +'s to the -'s not the -'s to the -'s and +'s to the +'s.


any questions please ask im happy to help
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Old 05-19-2008, 03:31 PM   #3
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btw... im gonna really push you not to use the OE wiring here... its a major PITA that you dont have to go through. An easier way to use the foglight switch is to figure outwhich wire coming out of the headlight switch is for foglights, and tap into it, put a fuse before the resistor in my progression above, and youre good to go, no foglight mod necessary.

This is the way I would do it if I were using the foglight switch

+12V foglight wire from headlight switch->fuse holder from radio shack->resistor->(+lead,LED,-lead)->(+lead,LED,-lead)->(+lead,LED,-lead)->(+lead,LED,-lead)->ground


I should also note that resistors and fuses work in both directions, it does not matter which lead goes where
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Old 05-19-2008, 07:18 PM   #4
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Thanks for all the help. Looks like I was quite confused..lol.

How would I do it with a switch?? What power source would I be using? Battery? fuse box?

Could I wire it like... to the cigarette lighter fuse? Its a 20 amp and its not controlled by a stock switch...

so like this?

cig fuse ->resistor-> switch lead -> switch -> other switch lead to (+) LED wire then (-) LED and run it across, then have the ground at the end?

I plan on buying prewired 5mm LEDs from http://www.oznium.com , which have resistors.

Thanks
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Old 05-19-2008, 07:34 PM   #5
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with a switch (you can get 12V-capable switches from radio shack) you can pull it from anywhere basically... Most people use the cigar lighter. It has a big orange/green wire and a black wire, the black is ground and the orange is +12V. And dont forget a fuse holder between the switch and your circuit elements.

Also, the resistor doesnt have to go after the fuse, but that is the best place for it in theory.
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Old 05-19-2008, 11:05 PM   #6
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So, cut the lighter wire in half, then splice the switch right into it, and crimp/connect it all together?

and by placing a fuse holder, you mean between the switch and LED's?

Sorry, never wired a thing in my life..

Thanks again
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Old 05-20-2008, 12:15 AM   #7
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You can actually splice a wire into it that runs to the switch instead of running a switch right off of it. DO NOT JUST CRIMP!! Solder (pronounced sodder) is your friend! and also do NOT just leave your solder job hanging out in the open!!! use electrical tape by starting and ending a couple of wraps up and down the wire of your splice, or use heat shrink.

this is what you need, note the type of switch you need is SPST (single pole, single throw)

http://www.radioshack.com/product/in...entPage=search

http://www.radioshack.com/product/in...entPage=search

just be confident that you can learn and keep at it! If you need to know how to do stuff like solder just go to google and type in: how to solder. Youtube also has several good videos on how to solder.

regarding circuits:
generally, there are good places to put things, some are by convention, some are more important for safety.

switches are usually placed between the load and the source. Here, the load is the resistor and the LED's, and the source is the +12V source.

fuses are usually placed between the switch and the source, as close to the source as possible.

resistors, if needed, are usually placed between the fuse and the load

the load is usually placed as close to the ground as possible.
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Old 05-20-2008, 11:38 AM   #8
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So...this is how it would be done? (I made a little picture..lol)



Would I solder the wires onto the resistor connectors?

and solder them onto the connectors on the switch? or is there special connectors?

Thanks
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Old 05-20-2008, 11:41 AM   #9
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The resistor should be running directly to the LED's I believe.... (Easiest if you just buy prewired ones)

So batt straight to fuse...with LED's with there own resistor.
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Old 05-20-2008, 11:50 AM   #10
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solder can take the place of any connector, of all the wiring ive done in my car (believe me there has been A LOT) I only have 2 quick-disconnect connections, the rest are soldered wires or setscrew compression fittings. Resistors just have leads on them like LED's do, its a little tough to do at first but you will figure it out. Practice soldering LED's and resistors on a table before you go to your car. Remember it can always be un-soldered, just heat it up also remember resistors get really hot when youre soldering them, so wear gloves or use pliers or vice grips, clamp around the lead not the resistor itself.

I would move the resistor to between the LED's and the switch

you do not need to ground the switch, when it is open it is open thats all there is to it.

One more thing to note, LED's dont like a lot of heat, so dont leave the solder iron on their leads for too long.
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