LED lights draw significantly less current than an standard bulb. The way standard turn signals work is if one of your bulbs is burned out the turn signal flasher senses the decrease in current draw and causes what we call hyper flash. You have seen cars on the road with a turn signal flashing faster than normal. That is hyper flash. Running LEDs will cause the same thing because of the lower current draw. Now I have run LEDs on just the rear and all was fine because the current draw was not low enough to cause this. Running LEDs in all four corners will cause hyper flash. This is when you need a load equalizer. Basically a load equalizer compensates for the low power draw of LEDs