Question about 1998 Jeep Cherokee

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Check gauges light came on while driving my 1998 Jeep Cherokee Sport and the battery dial was up at 19(Volts?). When I stopped at a light the light turned off and the battery gauge dropped to 14(normal). When I started driving again the warning light returned, battery jumped up, and the radio turned on and off the rest of the way home. As I pulled into the garage and the car died (knew this was coming). The jeep started right back up and no warning light. I was thinking it could be the alternator, but I'm not good with electrical so not sure.

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Sgt mac 1981, It sounds to me like the internal voltage regulator in your alternator is going bad. To check this, if you have access to a volt meter, put the black lead from the meter on the negative terminal of the battery and the red lead to the back of the alternator. Take the rubber boot off the large wire on the back of the alternator and place the lead on this wire. You can get the same result by placing it on the positive side of the battery. Take a reading when the vehicle is idling. A good alternator will put out 13.6 to 14.6 volts. Turn on the headlights, the windshield wipers and the interior blower motor on high and take another reading. Have someone step on the gas pedal and raise the RPM's to about 2000. Take another reading with RPM's raised. Take another reading as the engine goes back to idle. If any of these readings exceeds the limits for a good alternator then replace the alternator. Good luck with this.

Posted on May 26, 2011

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Replace your voltage regulator...hope it did'nt fry your battery ??

Posted on May 26, 2011

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