While riding my 21 RT yesterday I noticed that the radiator fan did not shut off after I turned off the trike. It sat in front of my house for a couple of hours when I finished riding, and the fan never cut off. When I went to start my RT it would not start, so I disconnected the battery. Today I connected the battery back and the fan turned on again. So disconnected and pulled the battery out so that I could charge it. Any ideas on what the issue could be and how I could fix it? Thanks.