The way i run the wiring down is through the factory roof bar... The front end of it, the plastic curved piece, you will see it has a seam in the middle, the one half of it pops off to get access to the bolts that holds it to the roof. Then what i did is unbolt it and just carefully move it aside and drill a hole about an inch back from the front bolt hole through the roof, then just touched up the bare metal with some primer and then glued in a rubber grommet. The wiring goes up the front corner, the a-pillar, across the roof at the top of the drivers door and then up through that new hole. Then i drilled a small hole through the inside half of the roof bar plastic so its facing towards the lights, the piece that the bolts are in to the roof, and installed a grommet there to pass the wires out to the lights. I put a weatherpack type connector inbetween the lights and the vehicles wiring so i can always disconnect and pull off my roof rack if needed. The ground from the lights goes to a ring terminal on the front bolt holding the roof bar to the roof, just the positive goes down through the roof.
Then i just put some RTV around the wire in the grommets and bolted it back down and snapped that piece back on.
