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The charging voltage is calibrated by the manufacturer in the voltage regulator and should not be changed, as this may damage the battery. Divergent values may be caused by voltage drops in the connections or wires, lack of alternator power, low engine or alternator speed, among others. Perform a diagnosis to identify the cause. Deliberately changing the regulator voltage only makes sense under special conditions of use, at the user's discretion. @aparecido oliveira blog: http://aparecidooliveira.blogspot.com/