When you ride electric vehicles,maybe you will find some problems,like the controller damaged,the battery damaged and so on.Today we will provide to you the methods of how to change the controller of electric vehicles.First,you need to check the type of controller,and then you need to find the position of controller.The most important thing is that you should to buy controllers of the same model.when you change the controller,you must turn off all power supplies,this step can ensure your safe.Next,you need to take off the old controller.In this progess,you need to pay attention to the connecting lines of each part.And then you only to install the new controller along the thread.