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What is the purpose of using an alternator in an engine?


An Alternator provides a slightly higher voltage output than a battery voltage. A battery provides current to energize or excite the alternator and assists in stabilising initial alternator output and an alternator uses mechanical power from the engine to supply electricity. An alternator links the engine-rotating shaft pulley with the alternator pulley to drive the alternator, and with the voltage regulator, ammeter, voltmeter, or warning light to inform the operator of charging system condition. The functions performed by an alternator can be summarised as follows:
It recharges the battery when the engine cranks or when the use of electrical accessories with the engine is turned off.
It provides all the electricity for the vehicle once the engine is running and changes output to fulfill totally different electrical loads.

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