no
but if you mess with cart and do not unhook a battery cable you can kill a Curtis Controller
A diode is a semiconductor device that essentially acts as a one-way switch for current. It allows current to flow easily in one direction, but severely restricts current from flowing in the opposite direction.
always jack up cart on jack stands when working on it
to test controller
Connect the negative probe to the controller's M terminal and positive probe to the B+ terminal. Press the go pedal and watch to see if the voltage increases. It should increase from a reading of 0 to the full voltage of the battery. If the motor is not turning, the problem may be in the directional switch or motor