Question about 1998 Jeep Cherokee

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Bad Voltage Regulator

I have a 1998 Jeep Cherokee. The Genorator Guage goes on about 30 seconds after starting the car and reving it up to a few thousand RPM. At first I thought it was the alternator, so I replaced that which didn't solve the problem. I changed out the battery which was old, but the light still comes on. I'm thinking now that it is the voltage regulator. Is there any way to check this, and what is the solution?

Posted by Patrick Dawson on


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Hi there:
The voltage regulator for the alternator is internal to the powertrain control module (PCM) and the PCM is located on the passenger's side under the hood on the fire wall; HERE diagram.

If you can't get to the wires with it running check the wires with an ohm meter to make sure there are no bad wires. HERE is a diagram to help.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Posted on Nov 12, 2012


5 Related Answers


  • 328 Answers

SOURCE: voltage regulator

it's in the alternator,the easiest way to fix it is to replace the alternator.

Posted on Dec 28, 2008



  • 77 Answers

SOURCE: Voltage Regulator

inside the alternator. look at the back of alt and where the wires go to inside.

Posted on Jan 13, 2009


  • 344 Answers

SOURCE: 95 2.5 jeep wrangler stalls consistantly and will

I had the same issue with my 4.0, I went through all the same BS you did and in the end it was a faulty fuel pump. Pricy i know but im sure thats your problem

Posted on Nov 15, 2009

SOURCE: Check engine light comes on, dash gauge shows

Check the connections at the alternator and battery. If they test out OK it does sound like the alternator is on it's way out. The regulator is built into the alternator on your vehicle.

Posted on Nov 29, 2009

Testimonial: "Thank you for your help. Your answer confirms just what I was afraid of... new alternator. $$$. Early Xmas present for you, good ol'Cherokee..."

Ted Schore

  • 7353 Answers

SOURCE: I have a 1993 jeep

How can the Alt and Battery be good, but not charging? The Voltage Regulator is inside the alternator. Keep out of the Parts Store and take it to a shop and have it checked on the truck. you may have wiring issues.

Posted on May 14, 2010

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1 Answer

Charging system voltage low

there are only 3 parts. but the causes are 25 or more.
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2: engine rpm below 800 RPM (lots of ways ,ask )
3: ALT had.
4: wiring to ALT bad.
5: bad battery or its connections, (wires)
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7: car is PCM alt controlled, it can be bad too. see 2 field wires on ALT and PCM on page 20? below?
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the fSM covers all tests above.

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