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A vehicle's charging system maintains battery charge and supplies electrical loads while the engine runs. This circuit shows the main components and connections for a typical alternator-based system.
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01
Use alternator as the primary power source when engine is running
02
Diode D_alt prevents battery discharge through alternator when stopped
03
Charge lamp indicates charging status and provides field current excitation
Applicable to most 12V automotive electrical systems with an alternator and external or internal voltage regulator.