Have you tested the connection for power ? If you hot wire the Fan Motor does it work ? Have you checked the fuse ? Even if it looks good change it as the can look OK and be bad if not blown.. If you have power to the fan motor and still not working run a temporary ground and see what happens. all I can think of for now ! Hope the gear heads speak up !
But WELCOME to the group and please UPDATE us what you find as you may help someone else ! And Hoa about a picture of your truck would love to see it