ACDelco Gold (Professional) NEW Alternators are manufactured with all new components and are the ideal high quality replacement for many vehicles on the road today. Key components are lubricated to help with performance and long life reliability. Alternators have regulators that are computer tested for voltage stability, terminal function, and electronic circuit board integrity. These premium aftermarket replacement components are manufactured to meet your expectations for fit, form, and function. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional.