Electrical issues draining the battery. Had rain and snow and the heater fan won’t turn off. Likewise the 4x4 light is blinking.

Hello, check for possible water intrusion inside the vehicle, especially in areas where there are electrical components. I've seen water leaks cause major issues due to water intrusion to fuse box or body control modules (GEM module). This is a wild guess, but since it seems like your concerns have begun after weather, it's a possible clue. Other than that, hands on testing with equipment capable of testing body control module components (like Ford's IDS tool) is needed.