The Club Car DS V-Glide Wiper Brush is the arm that wipes over your throttle sensor. Club Car has had several different types of sensors over the years, this being one of the first. Even though this is used for a solid-state system in most cases, this same device was used to send the power directly to the resistor coils.The golf cart v-glide is a bank of stationary copper contacts that allow the wiper brush to pick up a signal off of them and send it to your controller. This is done with a bank of small resistors mounted to the back of your v-glide, connecting contacts together. These provide the resistance that the controller interprets as a throttle signal. Once it gets it, the caddie will take off. But if the golf cart wiper brush or stationary contacts have worn down, the signal will not come through clearly, and the car's throttle will be erratic. Call Buggies Unlimited and get one ordered today. We will get it shipped quickly.