The Voltage Regulator is used in Mercury Capri vehicles to control the output of the alternator so as not to overcharge the battery and the electrical system and to keep the voltage range to 13. 5 to 14. 5 volts. This is done by the regulating the battery voltage as well as the system demand and controlling the field current to the alternator rotor. When the battery needs to be charged the regulator increases the field current; it reduces the current when the battery is fully charged to avoid overcharging. Mercury Capri cars of the past had mechanical external voltage regulators that were coil and point type but which had a tendency to wear out and fail. These were later on substituted by the electronic, solid-state voltage regulators which are more efficient in their operation in comparison to the mechanical types which switch on and off 200 times in a second while the new ones switch up to 7000 times in a second. In the course of time, external regulators were incorporated into the alternator, and the modern car may have the voltage regulator function handled by the powertrain control module (PCM), which takes into consideration various parameters to control the charging system output.
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