Question about 2002 Jeep Grand Cherokee

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2002 4.0L Jeep Grand Cherokee

At apparently random times the gauges start to jump and the different warning lights come on and off. At the same time and also at different random times the voltmeter starts to cycle between 12 volts and 14 volts at idle. I checked at the battery with a voltmeter and I can see this cyling there. I took the Jeep to autozone and they could not find anything wrong with the alternator at that time but the voltaghe was steady, of course.

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Sounds like an intermittent bad voltage regulator inside the alternator,although it could possibly be a loose wiring conecton.You are doing good by checking system voltage at the battery with the engine running.Check for clean tight electrical connections at the battery and at the alternator.Also check grounds.

Posted on Jul 19, 2008

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