I had the same problem when installing Halo HIDs on my 04. You have to run your plug n play harness to the factory harness, and your Halo/LEDs have to be wired into the Parking light wiring. Use a volt meter to determine what the three wires going into the blinker/parking light do. One is the ground and one operates blikner and the other for the parking light. Hook up the + to one of the wires and the - to ground, turn your parking lights on, if the meter reads a solid reading, hook up the led/halos to that. if no reading, turn the blinker on, it the reading should jump. It took me a while to figure this out.