Does this kit come with all wiring harnesses?

Yes—the switch assembly includes the harness needed to connect to factory power points. No cutting into OEM wiring required.

Will I need to remove the factory bumper to install these?

Installation uses factory mounting points. You may need to remove bumper trim pieces for access, depending on your truck's year. Check your service manual for specific disassembly steps.

Do the bulbs come pre-installed?

Assemblies ship ready to mount. Verify bulb type matches your owner's manual before final installation.