Generator voltage regulator (Opel Vectra B)

The alternator in a car can be compared to a bicycle alternator: the faster the alternator rotates, the higher the voltage rises and, consequently, the higher the current supplied. The current consumers in a car would not withstand such a rise and fall of voltage for long, so a special regulator must limit the alternator voltage and prevent overcharging of the battery. This regulator, the electronic excitation circuit regulator, is screwed to the outside of the Bosch alternator. In the Delco Remy alternator, the regulator is inside the housing.

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