Improve Capability: Be used for prevents over charging battery and improve charging capability. Function: Voltage Regulator Rectifier can have a good stable voltage, reduce clutter interference, protect the battery. Universal Motorcycle Rectifier Voltage Regulator For Royal For Enfield Himalayan 400 2017 2019 587356C. Voltage regulator:it ensures that the voltage output is stable, which in turn optimizes the performance of the motorcycle. Stabilizer:this voltage regulator rectifier prevents potential damage to the electrical components of your motorcycle.