MBM76 said:I have had defective tachometers short out and kill modules. Also make sure your motor has a good ground, if your battery grounds goes to the frame or the cage, run a ground from the motor to the frame. When you replace the module make sure you put a good coating of heat transfer grease on the bottom of it. And use a good quality module, I have had cheap aftermarket modules from parts stores go bad in a short amount of time.