Do these lights require any wiring modifications or a relay harness?

The switch comes integrated with the kit. You'll need to run power and ground to the switch location — your vehicle's service manual will show the exact routing and breaker size. No custom relay harness is required if you follow factory wiring practices.

Will these mount directly without trimming the fascia?

These are designed for factory mounting points — no cutting or drilling needed. Test-fit before final installation to confirm clearance with your specific bumper cover. Some fitment variance exists across production runs.

What condition are the lights in — do they need paint prep before install?

These ship new and ready to install. The chrome bezel is pre-finished. If you plan to paint the housings a different color, light sanding and primer will prepare the surface — refer to your paint supplier's prep recommendations for hard plastic substrates.