Good advice about the plug! Another often missed failure point for fuse blowing is one of the wiper wheel boxes may be a bit tight. They can corrode and its quite a fiddle of a job to disconnect the wiper rack cable and check to see if they are free and even more fun and games to strip out a wheel box and free and lube it up. When they go tight the wiper motor works against the mechanical resistance and the amperage increases and can pop the fuse!
