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The engine ECU figures out the battery charge status through the signal from the battery
current sensor. When the battery charge is insufficient, the engine ECU increases the electric power
generation of the alternator. When the battery charge is sufficient, the engine ECU restricts
the electric power generation of the alternator to reduce the engine load.
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When the head lamp is lit, the engine load due to the alternator is increased, that is
the electrical power consumption is increased. When detecting the electrical load through the
input electrical load signal, the engine-ECU gradually increases the alternator G terminal OFF
duty. The engine-ECU carries out the control to increase the electric power generation of the alternator.
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