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Im arbi, the alternator of my isuzu bighorn 3.1D is not charging properly. when im not using lights the volt is 13, but when i turn on the lights the volt steps down to 10.

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Replace your alternater or have it load tested first. It seems that it wants to put out 13 volts or over, but once a load is placed on the charging circuit, it just can't keep up.

Posted on Feb 01, 2010

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