Charging system testing

Determining battery state of charge is the first step in testing the alternator. The battery must be at least 75 percent charged before the alternator will perform to specifications. (Some manufacturers specify that the battery must be 95 to 100 percent charged before testing the alternator.) Recharge the battery if the charge is low; if it will not accept a charge, a fully charged test battery should be installed in its place before testing the charging system.

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