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Message: <blockquote data-quote="ConKBot" data-source="post: 5472248" data-attributes="member: 603119">12.9-13V may either be the alternator putting out a low voltage or it may be all battery voltage youre reading, probably alternator since the battery would sag quick with all that load on.The alternator could be working 'normally' but by design its idle output is low, You could try to find another alternator that has a higher idle output, or you could try to find a smaller pulley for the alt to raise its speed at idle.</blockquote>

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