Now that you have the new taillight and the wiring harness, you're ready to install the new taillight. First, make sure the plastic around the taillight is cleaned of any dirt and debris, as this can interfere with the light's fit. Unscrew the mounting screws and remove the old taillight. Now, connect the wiring harness to the new taillight and secure it in place with the mounting screws. Make sure the wiring harness is snugly connected and that the new taillight is firmly in place. You should also double-check to ensure the tail light plastic is properly secured and that no wiring is exposed. Once your taillight is securely installed, you're done! Learn how to fix broken tail light plastic
https://carspartshop.com/tail-....light/how-to-fix-a-b