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First check the belt. If it is loose then tighten it until you have a 1/2 " deflection at dead center. If the belt is frayed or looks bad, replace it. Check the voltage output at the battery posts with a multimeter set to DC voltage in the 20 volt range engine idling. You should get from 13.5 to 16 volts. Any more or less and the alternator is bad.

Later vehicles use a flat belt in place of the v belt. If there is not an auto adjust system, adjust the belt so that just 90o of twist can be achieved in the longest free part of the belt. Before you condemn the alternator check that all the grounding cable connections between the battery and engine/transmission and the body are clean and tight.

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