LED turn signal problem

[chico]

Has anybody else out there installed led turn signals on a klx 250s
I decided to change the stock big bulky looking turn signals for a nice sleek looking LED lights.
I hooked up the front lights which worked great everything worked fine but when I removed the rear lights and put on the rear LED turn signals all the lights flashed at once no matter which signal was put on and no indicator light on the dash
Has anybody else run into this Any idea's?
Cheer patrick document.write('/forums/images/emoticons/confused.gif');

 

[mint400]

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With replacement signal bulb problems, most people get the bulb wattage or more correctly current draw of the replacement wrong. Current draw needs to be "almost identical" to the original bulb in most passive systems to get the correct flashing frequency. If all lights are going something is very wrong and wiring should be double checked with the ignition off. Even test with a reinstall of old bulbs.

Confirm via your schematic (or old turn signal wire colours) that you haven't tapped into the rear brake light wiring by accident providing an alternate ground or source voltage to the turn signals. Did the LED lights dictate an additional connection beyond the original 2 wires?

just curious, were the original signals LED? If so LED polarity may be part of the design.

yer bike may be different, but according to my schematic... it is impossible to have all four turn signals going due to the nature of the single pole turn signal switch and how the relay is used only for one set or the other? If the KLX uses a computer to generate flash frequency you could have a problem.

To trouble shoot online you'll need to provide more data, such as the flash rate and any other peculiarities. Can you scan the KLX schematic and send it to me? I could likely tell you pretty quick.
John
m400

 

[omi]

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just stick your left arm out when you want to turn left etc:

 

[vexorg]

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Certain combinations of LED signals and bikes require the use of "resistor packs" inline with the signals. I can't remember the correct name for them right now, I'm sure some other DSBC'er will though. Basically, LEDs have much less resistance than the original bulbs, so the signal relay doesn't work right. I think this can be fixed with an electronic signal relay, but I'm not 100% sure.

 

[cactusreid]

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i just ran into this exact problem when i wired up my 525 for signals,using sicass led signals. i,m betting you have a dashboard indicator light. the resistance is so low in the led's that it backtracks through the tiny incandesant dash light causing all 4 lights to get some power-enough to light up and flash! pull out the dash indicator bulb,and your lights will probably flash as they should. (you do need a led style flasher relay in the system for the same reasons above) if this fixes your problems,,as it did mine,make up a pair of diodes to accept power from both wires that provides the flash pulses from the rt and lt signal lights. then just ground the other side of the dashboard indicator light and you should be "golden". diodes allow power to travel through themselves in only one direction,and will not allow it to backtrack down the incoming wire. hope this helps! by the way,i'm no expert,but a friend of mine( mr. resistor ) as we call him figured this out for me.

 

[tomcycle]

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Usually its the resistance with the flasher unit there is just enough current to turn the flasher on but not enough to make it flash. Installing a resistors defeats the purpose of the low current draw of the led.

Baja designs has an electraonicflasher just for you, I used it with my LED lights on the KLX and it works great. Think is is 17.00 US

Tom

 

[mint400]

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toms suggestion for an electronic flasher is the ideal fix... however it may require some tricky rewiring to your harnesses and factory assemblies.

To repair cheaply you need to match the current on the replacement LED device assembly to the original bulb it replaces. My bulb have stamped on it 12V21W - I emulated them with a brighter halogen equivalent.

-apply 12V to the original bulb and record the current it draws
likely 1.75Amps or so

-apply 12V to the replacement LED device.
likely nil

-subtract to find the missing current
1.75A - 0

-calculate the Resistance required (12V / missing current) ohms
7 ohms

-calculate resistor minimum wattage (12V * missing current) watts
21watts

-order a resistor pack as mentioned or go to an electronics store (active electronics) and get a very close Resistor with a similar or higher wattage. It should be under $5 (approx 21W 7ohms)

-apply that resistor in parallel with the LED device (connect ins together and outs together ) and apply 12V to confirm correct current

-if current is correct you have effectively emulated a bulb with an LED for a passive (capacitively timed) signal relay system

-when you install confirm LED polarity / orientation is correct before soldering by replacing and turning on your signals one at a time


note:
- the resistor may get hot and melt stuff (test for heat and locate accordingly)
- power saving is not an issue with turn signals for us, it is more about longevity of the bulb in our application

 

[cactusreid]

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grote also makes led compatible electronic flashers. available at lordo/automotive stores. i used one on my husky that i dualsported a couple years back.

 

[chico]

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Thanks for all the advice I'll get the LED flasher unit and give it a try