Good Luck, let us know how things turn out for you.I'd recommend checking the health of your new LED lamps since your stock lamps work normally. I would think they should light-up in unison with the indicator.
The original wiring uses a "sneak" current arrangement to illuminate the turn signal indicator. the small lamp in the speedo lights up, and, the "other side" turn signal bulbs provide the path to ground.example:you turn on the right turn signal.right turn signal power is applied to the right side of the indicator bulbcurrent flows through the indicator bulb and into the left turn trafficator bulbs.(since the indicator lamp is an order of magnatude smaller than the trafficator bulbs it glows brightly while the trafficator bulbs do not reach their illumination point.)Left turns operate the left side circuitry, and apply power to the left side of the indicator bulb, while the right side lamps provide the ground return.
replacement of the indicator with an LED will be inconsequential to the rest of the circuitry. (OEM or otherwise)I'm wondering if your new trafficator LED units are making proper contact in their sockets .......Just to verify ...... 1. You have installed the diodes, the original trafficator bulbs, and everything appears to function nominally. 2. You swap out the trafficator bulbs with new LED replacements and they do not light up. Also, the indicator does light up - but does not flash.
........It is weird .....
Well, there is an easy fix.talk your local electronic hobbiest out of an 8 ohm 20 watt resistor. mount that resistor between the output of the flasher and ground.The purpose is to replace the load of the trafficator bulbs.
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More important than the wiring is the actual mounting of such a heating element.You cannot mount it in the headlight housing. too much localized heat.It needs to be out where it can get good air circulation. If you have a B5 that would be somewhere behind the square sidecover on the bike's right side.Another important fact ...... I believe it will work to replace the need for a special flasher, however, I *do not* think it will make any difference to your LEDs that are failing to illuminate.
Bulletman,Autozone and virtually all auto shops have LED flasher units for $10-12. Take the unit from your C5 and pick one that has exactly the same connector configuration, and you will find that it will snap into your RE socket and work perfectly with the incandescents. The LED bulbs will require the diodes to prevent faint flashing of the opposite side lights. You will not need to add the resistor if you have the LED flasher.GSS