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Unread 04-22-2010, 08:24 AM   #1
NMLJ
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Advice to anyone installing front led turn signals/ marker lights

I recently upgraded to tube fenders, and decided I wanted a single 2.5" amber led to replace my two factory turn signal/ marker lights. I spent hours researching the best way to do this... Some threads had you adding resistors and diodes to your wiring, some even talked about adding relays. All I wanted to acomplish is a 2.5" led that would turn on with my marker lights and blink with my flashers.

All it takes is cutting out the 2 wire marker on the side of your fender and adding your led. Then find a spot under your hood to hide the 3 wire marker (with light bulb protected by it's housing). I cant find any other way to have a 2 wire led work without keeping the old 3 wire light it the wiring. Also, if you havent already upgrade your flasher, you need to do that too. http://http://www.stu-offroad.com/el...led1/led-5.htm

I'm posting this to help anyone who wants the easiest solution to the nightmare of adding led lighting to the front of their jeep. I tried the other ways and never got the results I was after.

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Unread 04-24-2010, 06:44 PM   #2
wushaw
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I installed 2.5" 3 wire LEDs in ft. like the JKs & CJs are installed then I installed 2" 3 wire LEDs in the side of the fender, I just installed a ground wire for the side lamps. Also fixed the flasher to work correctly for my year model.
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Unread 04-24-2010, 06:54 PM   #3
1CleanTJ
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not really a fix as you still dont have front signals..........

you can use 2 wire led's to replace the 3 wire setup (stock) if you do a tiny bit of wiring , that way you can have full front leds

http://www.jeepforum.com/forum/f9/2-...ite-up-933239/
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Unread 04-26-2010, 12:57 PM   #4
NMLJ
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Quote:
Originally Posted by 1CleanTJ View Post
not really a fix as you still dont have front signals..........

you can use 2 wire led's to replace the 3 wire setup (stock) if you do a tiny bit of wiring , that way you can have full front leds

http://www.jeepforum.com/forum/f9/2-...ite-up-933239/
I do have front turn signals...

When the marker lighs are off, the led flashes on and off like a standard turn signal.

When the marker lights are on, the leds are on. And when I use my turn signals, it blinks on and off.

My led is either 100% on or off.
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Last edited by NMLJ; 04-26-2010 at 01:10 PM..
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Unread 08-06-2010, 07:47 AM   #5
valgalbraith
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http://www.jeepforum.com/forum/f9/le...8/#post9890708

This may help if you haven't already figured it out
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Unread 01-20-2012, 08:32 PM   #6
Rugby_3
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Quote:
Originally Posted by NMLJ View Post
I do have front turn signals...

When the marker lighs are off, the led flashes on and off like a standard turn signal.

When the marker lights are on, the leds are on. And when I use my turn signals, it blinks on and off.

My led is either 100% on or off.
Mine are similar but I am not able to get them to come on when the lights are on. They staff off until I hit the turn signal, then they come on and blink. How did you wire yours up? Has it been determined that if there is a 2 wire led it is either 100% on or off. I don't think the 2 wire led is able to have off, dim light, and brighter light for blinking.
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Unread 01-20-2012, 10:18 PM   #7
ytowntj
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When I did mine i did the JK housings in the grill and small recessed 2 wire LED side markers in the tubes. I forget the combination of resistors and diodes I used, but with headlights off the turn signals and side markers flash in tandem on/off and headlights on they alternate dim/bright opposite of each other as outlined by DOT. Just throwing another alternative out there. If someone needs I can look up the resistor setup
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Unread 01-20-2012, 10:31 PM   #8
NMLJ
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Originally Posted by Rugby_3 View Post
Mine are similar but I am not able to get them to come on when the lights are on. They staff off until I hit the turn signal, then they come on and blink. How did you wire yours up? Has it been determined that if there is a 2 wire led it is either 100% on or off. I don't think the 2 wire led is able to have off, dim light, and brighter light for blinking.
That's strange. How exactly do you have yours wired. Still using the 3 wire light with your 2 wire led?
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Unread 01-21-2012, 06:51 AM   #9
ken white
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If you want the 2 wire LED's to go completely on/off and be useful as turn signal and running lights, you will need 2 diode bridges, 2 - 10W, 10 Ohm resistors, and 1 - 20W, 10 Ohm resistor (ignore the wattage ratings on the schematic). This high power solution doesn't require a flasher fix unless the rear lamps are replaced with LED's too.






Here is the theory of operation for this modification which is only used if you are running a 2-wire LED module:

Resistors R1 and R2 provide a low impedance ground path to the floating turn signal and running light wiring after the lamps have been removed from the original circuits.
Diodes D1-D4 form a bridge circuit and control the current flow through the LED module which is developed by turning on the running lights and/or turn signal. Diodes D1-D4 are shown as discreet components but they can also be purchased as a single monolithic device - see picture below.





If you look at the image of the monolithic device above, and my schematic, you will notice terminals marked as: +, -, and 2 ~ (AC).

Connect the left or right turn signal wire (tan or grey) to one of the diodes middle ~ pins and then connect the running light wire (black/yellow) to the other middle ~ pin. You will also need to connect one end of each the power resistors to the junction/connection point made at each of the diodes ~ and wire connections. The other side of each resistor is then tied to ground through the black wire. Now connect the LED module's + wire to the diodes + pin and the LED's - wire to the diodes - pin. One turn signal/running light modification is now complete. Perform the same steps for the other side...

When the running lights are off, R1 provides a ground path for the turn signals. When the turn signal is turned on, R2 sees the full 13.7 VDC across it and dissipates about 9.69 watts. The 13.7 VDC is also applied to diode D1 which controls the current path through the LED module and through diode D4 and R1. R1 will have a very small voltage developed across since the current will primarily be controlled by the LED module. When the turn signal is off, the LED module sees an effective ground potential on each side and will be off.

When the running lights are turned on, R2 provides a ground path for the running lights. Resistor R1 sees the full 13.7 VDC across it and dissipates about 18.77 watts. The 13.7 VDC is also applied to diode D3 which controls the current path through the LED module and through D2 and R2. R2 will have a very small voltage developed across it since the current is limited by the diodes and LED module. When the turn signal is turned on, D2 and D4 both become reverse biased and will stop current flow through the LED module - the LED module turns off which means the turn signals are working in conjunction with the running lights. Resistor R2 sees 13.7 VDC across it during this condition and dissipates a high wattage again.

I have a design that is very low power (less than 100 mW) and works very well, but it requires transistors, zener diodes, and a few resistors. Maybe someday I will produce it if there is a big enough market...
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Unread 01-21-2012, 10:08 AM   #10
Rugby_3
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Quote:
Originally Posted by NMLJ View Post
That's strange. How exactly do you have yours wired. Still using the 3 wire light with your 2 wire led?
I think the turn signal light is over riding the running light. I wonder if there is some priority set up in the wiring. I am looking at trying to fix this issue and found a thread that explained it so I could understand it and the purpose of the resistors and how basically you take one wire and turn it into two. Now just to make the resistor and hook it up.
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Unread 02-25-2013, 07:22 PM   #11
Re-Jeeper
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Outstanding posts... I'm hoping to try doing mine soon...
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front turn signals , led , tube fenders

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