Will this plug straight into my factory wiring harness?

Yes — the connector matches OEM spec, so you can wire it directly to your existing door harness. No adapters or splicing needed if your FJ still has original electrical.

Do I need new fasteners to install this?

Mounting hardware is not included — use the fasteners from your factory mirror. Test-fit before final assembly to confirm bolt alignment with your door panel.

What if the mirror doesn't power up after installation?

Check that power reaches the connector and ground is solid at the door. If wiring checks out but the mirror is dead, verify your FJ's power window circuit is live — mirrors share that fuse on this model.