Recently I went to a restaurant. When I came back out the radiator fan to my Vulcan 750 was still running. I turned the motorcycle on and off and the fan went off. I did not think about it again when I came home. The next day the fan ran untill it drained the battery. When I started to charge the battery when the motorcycle had not even been running, the fan came on again. Is the thermo sensor to the radiator bad? Is there a short circuit? I do not want to spend a lot of money replacing parts until I have some idea what to do first. Does anyone have some ideas, why the fan was stuck on. Thanks in advance for any suggestions.