Do you mean the Full Harness to split the beams of your headlight or just the Halos?

The harness is simple. Red Wires go to the battery then only one headlight plug goes into the harness and then the other two plugs go to the lights. Then you ground the plug to the lights..(black wire) to any good ground area it can reach.

For just the Halos it can go to any hot wire you want. Sidemarkers headlight or a switch like they said above.

Hope this helps....

LAtes