Do I need to disconnect the battery before swapping the switch?

Yes. Always disconnect the negative battery terminal when working with electrical components. This prevents short circuits and protects both you and the vehicle's electrical system.

Will the wiring harness from my old switch work with this one?

The factory harness connector should mate directly since this is designed for the same mounting location. Test-fit before finalizing installation to confirm proper alignment.

Is this switch compatible with factory tinted windows or aftermarket glass?

This switch controls power delivery only—it works with any window configuration as long as the motor and regulator are functional. The glass type does not affect switch operation.