Do these mount at the factory attachment points?

Yes — these mirrors bolt directly to factory mounting locations with no drilling or bracket fabrication required.

Will the heating element drain my battery if I leave the truck parked?

The heater operates through the ignition circuit, so it only draws power when the engine is running. Turn it off manually after startup if you're parked and don't need defrosting.

What wiring does the LED turn signal need?

Power and ground tie into your existing side marker circuits — follow the included harness diagram to match the truck's OEM signal lines. No additional relays needed.