Will this plug directly into my car's existing wiring?

Yes. This assembly is OEM, so it connects to the factory mirror connector and signal harness without adapters or splicing. Just confirm your current mirror has the same connector type before ordering.

Do I need any fasteners or hardware to install this?

The assembly mounts at factory rocker points. Bring standard hand tools and a trim removal kit to disconnect the old mirror safely. Bolts and trim clips are part of the factory assembly—no extra hardware required.

What if the power adjust stops working after install?

Check that the connector is fully seated and free of corrosion. If the mirror is mechanically sound but power fails, the issue is likely in the wiring harness or vehicle electrical—test with a multimeter at the connector before assuming a mirror defect.