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You need to replace it when you have tested the charging system of a car fitted with an alternator , and the checks in How to test a car battery point to a fault in the voltage regulator , make sure that. The fault may be elsewhere.
In the event that tests that are simple here usually do not work, make the vehicle to an auto-electrician; alternators suited to contemporary automobiles are often damaged.
Before doing any ongoing work with an alternator system apart from testing, disconnect both terminals associated with battery pack .
Wrong charging or no production can be because of a poorly earthed regulator.