The purpose of the Toyota Tercel Voltage Regulator is to enable the charging system to keep the alternator output to near 13.5 to 14.5 volts to keep the battery safe. This device continuously checks the battery voltage and demand of the vehicle. If output voltage drops, it raises the field current and lowers it if excess voltage appears to maintain balance rapidly. The early models of Tercel applied an external mechanical Voltage Regulator. A Voltage Regulator has coils and contact points which click about 200 times per second. It is vulnerable to pitted contacts. Sometimes, there is also overcharging. As technology progressed, Toyota exchanged that unit for a solid state Voltage Regulator utilizing transistors to detect the first signs of slip at a rate of about 7,000 on-off cycles per second. Such a unit has a much faster response and is more durable than the older unit which typically only had magnetic relay contacts. In later models, the Voltage Regulator was fitted within the alternator to reduce wiring and space problems, while the recent type hands control to the powertrain control module, one that monitors battery temperature, ambient heat and engine load for smarter charging. At every stage, Toyota Tercel drivers benefit from consistent lights, dependable starting, and longer-lasting components.
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