GM Genuine Parts Voltage Regulators are designed, engineered, and tested to rigorous standards, and are backed by General Motors. It monitors the proper voltage to your vehicle's critical systems as the starting and charging system starts the engine, maintains the battery's charge, and provides power to the electrical accessories while the engine is running. A GM Genuine Parts Voltage Regulator provides outstanding radio noise control for better performance and delivers needed system voltage. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).