Do these plug straight into my factory wiring?

These are designed for factory mounting points, but electrical connector compatibility varies by vehicle. Verify your factory harness matches before purchase — you may need an adapter harness depending on your truck's original lighting setup.

Are both DRL and headlight functions working, or just one?

The rectangle LEDs serve as your daytime running lights. Full headlight output is handled by the main LED array in the center of the housing. Both functions fire up when you turn on your lights.

Will these need any sealing or weatherproofing after install?

These come as complete sealed units. As long as you're mounting into your factory headlight opening and the gasket sits flush, water intrusion shouldn't be an issue — just make sure the opening itself is clean and free of debris before fitting them in.