Do I need to run new wiring, or does this plug into existing harness points?

The switch connects at factory electrical locations — no running new wire through the dash. Test-fit the harness connector to your truck before final install to confirm compatibility with your specific year.

Will these lights work with my factory bumper, or do I need to cut anything?

These mount at factory fog light points with the included bezel. If your truck came with factory fog openings, install is straightforward. If not, you'll need to evaluate bumper modification before committing.

What bulbs do these use, and are they included?

Bulbs are sold separately — confirm the bulb type for your specific Ram year before ordering. Most 2nd-gen Ram trucks run H10 or similar, but verify against your service manual to avoid fitment issues.