Help your tailgate window won't go up raining?

If your tailgate window won't go up and it's raining, first check the fuse related to the window mechanism, as a blown fuse can cause it to malfunction. Ensure that the window switch is functioning properly; you can test it by trying to operate the window from both the driver’s side and the tailgate. If the switch is working and the fuse is intact, the problem may lie in the window motor or wiring, which may require professional inspection. In the meantime, consider using a tarp or plastic cover to protect the interior from rain.