Battery Charge Relay Control
Some models are equipped with a battery. The battery provides power for only two purposes:
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Engaging the electric starter motor to start the engine
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Powering the 7S Display with the ignition key when the engine is off
The engine management system turns on the battery charge relay and charges the battery only when the following conditions are met:
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The load shed relay is turned on by the engine management system
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Engine speed exceeds 2500 RPM
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Chassis DC voltage exceeds 13 volts