Dim lights or very bright lights could signal alternator trouble. Similarly, if a car's electrical accessories start working erratically, it could mean the alternator needs to be checked. Sometimes a few of these accessories continue working while others don't; this is because many new cars are programmed with a list of priorities for receiving current. For example, the car's headlights may receive electricity as long as the alternator is producing it, while the radio may not receive current after the alternator's production drops below a predetermined level. This is because the headlights are vital to safe driving while a working radio is not.
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