Q: Sputtering issues and voltage gauge reading 0 on the dash.

asked by on

I have a 2000 Jeep grand Cherokee Laredo 4.0....the voltage gauge is not working and it spits and sputters while alternator is hooked up...if u unplug alternator it runs great until battery dies...I've replaced battery cables± grounds to and from battery...put a new starter in and alternator...does any 1 know what I should do next?
My car has an automatic transmission.

Hi there. Check all of the wiring from the alternator to the battery and power source box (fuse box). Make sure that all of the connections are in the right place and make sure that the wires are not corroded. It is possible that the alternator you have is either not hooked up correctly or the alternator is not working properly. Have the alternator checked to see how much AC voltage is leaking out. If there is more than 30 AC voltage producing, then the diodes inside the alternator are burned. If you need further assistance with your engine sputtering when you have the alternator hooked up and then works fine with the alternator disconnected, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Hello. From what you describe it would appear that your vehicle is experiencing some sort of issue with the electrical system. If the alternator is not charging, even after being replaced, then it may be possible that there is an issue with the voltage regulator. The voltage regulator is the component that controls the charging and output capacity of the alternator. For many vehicles the voltage regulator is integrated into the alternator, however for your model of Grand Cherokee the voltage regulator is located inside of the PCM, that is the engine computer. For this reason, a fault with the voltage regulator usually requires replacement of the PCM. A test of the voltage regulator circuit would be required to determine if this may be the case. I would recommend having a professional technician, such as one from YourMechanic, come to your location to diagnose what is causing your charging system to malfunction.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Sputtering issues and voltage gauge reading 0 on the dash.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Gas gauge not working

The gas "level" gauge relies on a sending unit in the fuel tank. You'll want to first confirm that the fuse in the circuit is in place and has continuity. If there is no issue there, the sending unit is...

Q: Car stalls when driving up steep inclines - 2015 Chevrolet Volt

I would escalate this issue throught the Chevrolet dealer support system. There should be a description of the process with addresses and phone numbers in your Owners Manual. This information can also be found here: http://www.chevrolet.com/contact/call-us.html

Q: Misfire on my engine and I am getting an injector code 27. (OBD1)

Hi there. The injector output driver is not responding properly to the control signal. Check the wiring from the computer to the injector driver. If the noid light is flashing erratically, then the controller (computer) is not functioning correctly. You...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...