How would u like the halo to turn on? wit the turn signals? or when u turn on ur marker lights?Either way Get a Light tester turn the car on, pull the corner light out and put either the markers or turn signals on and test to see which one outa the 3-4? ( dont remember but there should only be 3 ) wires get power.. Off the top of my head im not 100% but ill test it on my car.