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Common problem unfortunately---Check the amp rating on your alternator--probably stamped somewhere--check the size of you pulleys to determine if they are underdriven--if they are aluminum most likely they are underdriven--the crank pulley should be larger than the waterpump pulley and the alternator pully only about 3 inches. Lights and fans will take probably mininum of 100 amp modern one wire alternator to work reasonably well.
Jerry
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