Wiring harness with relay PURELUX Pro Series 12V, DT-4

To answer your question directly: Those open yellow and white wires control your integrated position lights, and they need to be connected to a 12V power source depending on when you want those lights to turn on. Here is exactly how they work and the best places to connect them: What the wires do: Because the DT-4 plug handles all four pins at the light itself, the harness brings the two position light power wires out for you to route manually. The White wire: Sends power to the white position LEDs. The Yellow wire: Sends power to the amber/orange position LEDs. Quick tip: You typically only want to provide power to one of these wires at a time, depending on which color you prefer to display! Where to connect them: You have three common options for where to wire your chosen colour, depending on how you want them to function: To your factory parking lights (Most Common): You can use a wire-tap to splice your chosen wire directly into the positive (+) wire of your vehicle's factory parking/marker lights. This way, your new position lights will turn on automatically in sync with your car's standard parking lights. To an ignition-switched fuse (For DRL use): If you want the position lights to be on all the time while driving, you can route the wire to your fuse box. Use a simple "fuse tap" to plug it into a fuse that only gets power when the engine is running (like the radio, cigarette lighter, or factory DRLs). To a manual switch: If you want total control, you can route the wire into your cabin and connect it to a dedicated 12V toggle switch or switch panel.