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The field winding carbon brush may have worn down and need replacing. The unit can be tested by spinning the pulley and applying +12 volts to the field winding if the pulley now resists turning it is generating electricity. The diode pack may need replacement but they are pretty robust these days, That leave the electronic charging control box to check. Look up costs of individual replacemnts and compare to an exchange unit, Your last option is to get one from an auto salvage dealer.

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Q: Can an alternator be repaired or does it have to be replaced?
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