I installed a pair of LED's (superbrightleds) and managed to resolve the hyperflash issue with the switchback blinker via resistor. Low/Hi beams (not that there's a difference) work perfectly as well as the blinker but the switchback feature isn't working, the function that allows the light to be white when it's not blinking just won't turn on.
I've used the ground coming from the main headlight into the resistor and blinker wire (blue) on the other side of the resistor.
Not sure what other information is needed, the led itself works fine.
<-- 3157 switchback, what I have
<-- basically identical to this issue
Last edited by llkm; 08-24-2017 at 08:31 AM.