Hi
I have a strange problem with turn signal, turn up yesterday
Left signal donīt work right is ok, hazard signal lights ok (both left and right) also security lights Ok( turn signals flashing left and right)
Sporster 1200 C 2004 with stock turn signals

 

Start by changing Left bulb (front/rear, whichever isn't flashing)...assuming you have stock signals vs. LEDs, and go from there. If that's not the issue, any recent electrical mods to be aware of? Check wiring for cracks, rubbing, splits, bad connection...etc.