Question about 2000 Jeep Wrangler

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What is the expected output of a alternator in a Jeep 4.0L Sahara (yr. 2000)? My Jeep's ''check gauges'' light came on, and the battery gauge dropped to nothing. Checked the alternator (with a voltage tester) and am getting power from it. Battery is an Interstate 4 years old, showing 11.7 volts when tested.

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You shoulld expect more than 12.8 volts from the alternator up to nearly 14 volts when charging a low battery. The battery can only show the amount of voltage your alternator is sending to it after being used for a while. I would suggest that you have the battery tested & recharged completely, your voltage will be above 12 volts and if it returns to below that , you will know your alternator is not charging. Also, if you test the output of the alternator and see it is below 12 volts after the battery is fully charged at 12+ volts you will have confimed the problem also.

good luck.

Posted on Jan 31, 2010

Testimonial: "Quick response and right on the money -alternator passed a test at the local autoparts store, the battery didn't. Thanks"

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