The turn signal lights on the front of my street rod are inside the headlights and they can be hard to see. I bought some LED bulbs (1157 68 SMD 1210 White LED Bulb Lamp Brake Stop Tail Light) on eBay, thinking they would be brighter and easier to see and than incandescent bulbs. But when I installed one of the LED bulbs on the left side and hit the turn signal, all of the lights flashed, including the turn signals on the right side, both front and back. Is this because I have the wrong type bulb or is it because I need an LED flasher or some resistance in the circuit? After I put the incandescent bulb back in, everything worked perfectly.