Does this switch plug straight into my factory wiring?

Yes. It uses factory electrical connectors, so it connects directly to the existing harness. No rewiring needed.

Will this work if only one window is stuck?

This is the master panel switch. If one window doesn't respond, the issue is usually the motor or regulator on that door, not the switch itself. Test the other windows first to confirm.

What's the return window if it doesn't work?

Contact ModSupply customer service with your order number. They'll walk you through diagnostics or process a replacement if the switch itself is defective.