The Voltage Regulator is an important component of the electrical charging system, and keeps your motorcycle battery from being overcharged and damaged. This section has information on common regulator types and troubleshooting information. There are a few common types of Voltage Regulators used on most motorcycles. The most common is a single or three phase regulator for permanent magnet charging systems. This type is used on the majority of modern street motorcycles. A different style of regulator is used on field coil regulated systems, which are found on many street motorcycles from the 1970's through early 1980's. And finally a very simple regulator is used on alternator type systems. Most Voltage Regulators contain a Rectifier component as well, and they are often referred to as 'Regulator-Rectifiers'. The Rectifier is a separate, but equally important component, which serves to convert ("rectify") the alternating current (AC) produced by the stator & flywheel to direct current (DC) necessary to charge a battery.