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Old 01-19-2014, 01:09 PM   #1
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changing dual filament to single?

I bought some single filament leds for the front of my tj after I built tube fenders and im trying to figure out how i can wire them so that i can have running lights aswell as signals, i cant find anything online could i run a resistor in my running lights then when my signals come on they can get brighter if anyone can point me in the right direction or knows of some links that would help that would be great

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Old 01-19-2014, 01:12 PM   #2
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Search for 3 wire to 2 wire conversion. Basically just a resistor and two diodes. The better option IMO is larger 3 wire LEDs in the grill then use the smaller 2 wire LEDs as markers.

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Old 01-19-2014, 01:20 PM   #3
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Im still trying to figure out what a "filament led" is??
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Old 01-19-2014, 02:49 PM   #4
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It does not work that way. While some led's are dimmable, most are either off or on, no part way on.

Go with freeskier's suggestion and get the right ones to start.
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Old 01-19-2014, 03:16 PM   #5
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It does not work that way. While some led's are dimmable, most are either off or on, no part way on.

Go with freeskier's suggestion and get the right ones to start.
That's not true. Simple resistor can drop light intensity, as long as you do the math right and get the right resistor. Dimming ability has nothing to do with the LED itself.
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Old 01-19-2014, 03:46 PM   #6
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Here you go. Just use these parts, and wire it like this and ground the neg side of the LED. Just shrink wrap bare conductors and put something semi rigid over it to protect it...Little plastic tubing etc.

Jeep LED Front Marker/Turn Signal Light Modification Parts List

Radio Shack Numbers (quantity enough for two harnesses)

4 Rectifier Diodes #IN4004
2 560 Ohm ˝ watt Resistors #271-1116
3 Colors 18 gauge wire
Solder
Heat shrink
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Old 01-19-2014, 10:23 PM   #7
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Thats great I will give that a go thanks for the help!
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Old 01-20-2014, 04:25 PM   #8
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Quote:
Originally Posted by Water Dog View Post
Here you go. Just use these parts, and wire it like this and ground the neg side of the LED. Just shrink wrap bare conductors and put something semi rigid over it to protect it...Little plastic tubing etc.

Jeep LED Front Marker/Turn Signal Light Modification Parts List

Radio Shack Numbers (quantity enough for two harnesses)

4 Rectifier Diodes #IN4004
2 560 Ohm ˝ watt Resistors #271-1116
3 Colors 18 gauge wire
Solder
Heat shrink
x2. Did it this last week and it works great. However it doesn't stop the light out fast blink
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Old 01-20-2014, 04:37 PM   #9
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x2. Did it this last week and it works great. However it doesn't stop the light out fast blink
Yea, if you've replaced the fronts/backs with led's it might not. The one we used this on still had the oem lights front and back (and it worked fine). He just swapped the side markers out to led's after cutting his flares. It may take a different flasher relay if the resistance values have changed alot.
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Old 01-21-2014, 11:10 AM   #10
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I have LED's all around. I replaced the flasher relay when I did the backs and it returned to normal with front OEM lights but having full time LED's now it went back to fast flash, regardless of relay.
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Old 01-21-2014, 03:47 PM   #11
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I have LED's all around. I replaced the flasher relay when I did the backs and it returned to normal with front OEM lights but having full time LED's now it went back to fast flash, regardless of relay.

You might be able to return it to normal if you just paralleled a resistor in your turn signal circuit. You would have to play around with the value to see what worked. Put an ohm meter across the contacts of your oem light bulb and measure the resistance on the blinker filiment to the base, then buy a resistor approximately the same value and tie one to the flasher output (pink wire on my "99"), and the other end to the ground wire on the flasher (black wire). I haven't tried it, but it should give the flasher the resistance it needs to see.
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Old 01-21-2014, 06:27 PM   #12
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Only thing is as oem filament is lit and gets hotter it's resistance goes up

Good thing filament bulbs work that way if opposite would be an endless cycle of hotter so less resistance so more current so hotter so less resistance so more current so hotter till the thing burnt up

So proper working resistance is higher than measured cold resistance
A accurate ohm meter measuring current with bulb lit with known/measured voltage would be enough to use ohms law and estimate lit resistance

Or maybe some has a good estimate of % resistance increase with illumination
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Old 01-21-2014, 06:29 PM   #13
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Only thing is as oem filament is lit and gets hotter it's resistance goes up

Good thing filament bulbs work that way if opposite would be an endless cycle of hotter so less resistance so more current so hotter so less resistance so more current so hotter till the thing burnt up

So proper working resistance is higher than measured cold resistance
A accurate ohm meter measuring current with bulb lit with known/measured voltage would be enough to use ohms law and estimate lit resistance

Or maybe some has a good estimate of % resistance increase with illumination
Good point. Thanks for the clarification.
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Old 01-22-2014, 02:21 PM   #14
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You might be able to return it to normal if you just paralleled a resistor in your turn signal circuit. You would have to play around with the value to see what worked. Put an ohm meter across the contacts of your oem light bulb and measure the resistance on the blinker filiment to the base, then buy a resistor approximately the same value and tie one to the flasher output (pink wire on my "99"), and the other end to the ground wire on the flasher (black wire). I haven't tried it, but it should give the flasher the resistance it needs to see.
The only problem with that is the LEDs were designed to work at full voltage. Adding a a resistor just to enable a voltage drop would bring the LEDs to a operating voltage it wasn't designed for and quite possibly much dimmer. I had considered it however.
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Old 01-22-2014, 03:25 PM   #15
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The only problem with that is the LEDs were designed to work at full voltage. Adding a a resistor just to enable a voltage drop would bring the LEDs to a operating voltage it wasn't designed for and quite possibly much dimmer. I had considered it however.
Actually, I've looked in to it a little further. I wasn't talking about adding a resistor in series with the existing load, but rather in parallel which would add load without robbing voltage. From what I've read since, it appears you should add about an 8 ohm, 25 watt load resistor at each light between the turn signal wire and ground. They would get pretty warm and should be screwed down to a metal surface. I've also seen where they make electronic flashers that are not dependent on wattage, but you would have to research to find out what's available for Jeeps. The downside to either one of these fixes, is if you have a light fail, you will not get the rapid flash, but if you're running all led's how often are you going to burn one out?

You might want to take a look at this: http://shop.poisonspyder.com/5-Pin-L.../41-04-106.htm
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Old 01-22-2014, 04:48 PM   #16
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The only problem with that is the LEDs were designed to work at full voltage. Adding a a resistor just to enable a voltage drop would bring the LEDs to a operating voltage it wasn't designed for and quite possibly much dimmer. I had considered it however.
Resistor is in parallel, voltage is the same. To stop the fast flashing you want to increase current draw. By adding a resistor in parallel you decrease the equivalent resistance and increase the current draw.

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