Why are both sides of my LED turn signals flashing at the same time?
I installed LED turn signals in place of my stock signals and now both right and left sides flash regardless of which direction I choose.
The signal indicator light on your dash is likely causing power to back feed into the wiring causing both sides to light up. This happens with your OEM signals too but the power spilling over isn't enough to make the bulbs illuminate. LED turn signals need significantly less power to illuminate.
You can leave the indicator light in by wiring up a diode kit. Otherwise the indicator light must be disconnected.