If you will be using headlights or any 12 volt accessories like a radio very often, we do recommend a voltage reducer. The voltage reducer will connect to your entire battery pack at the main positive and negative power connections(as shown in our instructions), the voltage reducer will then reduce the voltage from 48 or 36 volts down to 12 volts so you can connect any 12 volt accessories you would like to it. The voltage reducer sizing information can be found here to make sure you get the correct size: Voltage Reducer Sizing