The windshield interface may be cracked, or there may be a lack of lubrication in the water pump bearing or generator bearing, or the belt and the pulley slips, causing abnormal noise.
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According to the national standard, the regulated voltage of a 12V generator is 14.5 ± 0.25V
That is, under normal conditions working voltage, the maximum operating voltage of the generator is 14.75 V
According to national standards, the test voltage of the generator at full load is 13.5 ± 0.1 V
That is, under normal operating conditions, the generator voltage will not be less than 13.4 V
p>So, under normal circumstances, the generator voltage is between 13.4 and 14.75 V.