Do I need to run new wiring, or does this plug into factory locations?

The harness connects directly to factory wiring points on your truck—no splicing or running new lines through the firewall. Route it under the dash to the switch location and you're done.

Will these lights work if my truck didn't come with fogs from the factory?

Yes. This kit is designed to fit the factory fog holes in the bumper and uses the stock mounting points. If your truck has the holes, installation is straightforward.

Are bulbs included, or do I need to buy those separately?

Bulbs are not included with this kit. You'll need to source the correct bulb type for your truck's fog holes and install them into the light housings before mounting.