Will this bolt directly to my door without modification?

Yes. Factory mounting points align with OEM holes—no drilling or adapter brackets required. Bolt sequence follows standard torque specs in your service manual.

Does the power motor tap into existing wiring, or do I need to run new harness?

This assembly uses your existing power mirror harness. If your vehicle already has powered mirrors, connector plugs directly into the door loom. If switching from manual mirrors, you'll need to verify door wiring compatibility before purchase.

Are the turn signal wires already routed, or do I have to fish them through the door?

Turn signal wiring is pre-routed inside the mirror housing. You'll need to connect it to your door harness—the exact connection point depends on your door's wiring configuration. Check your wiring diagram for signal-light circuit location.