Do I need to wire these to the battery myself, or does the switch connect to existing harnesses?

The switch integrates into your dash, but you'll need to run power from the battery through a relay for proper operation. This requires basic electrical work — running wire, installing a relay, and making clean connections. If you're not comfortable with electrical, have a shop handle the wiring.

Will these lenses yellow or fade over time?

Amber lenses are prone to oxidation and UV damage like any exposed plastic. Regular cleaning and occasional UV-protective coating help slow fading, but expect some dulling after a few years of sun exposure.

What's the return process if these don't fit once I mount them?

Test-fit the bezel and housing before running any wiring or fastening permanently. Once installed and hardwired, returns become complicated. Confirm fitment visually before committing power and ground.