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A/C unit my check gauge light turns on and voltage gauge shows not charging?

Tiny
EDWOOSR667
  • MEMBER
  • 1998 JEEP GRAND CHEROKEE LAREDO
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
Hello, I have the vehicle listed above Grand Cherokee Laredo. So, what's going on is, when I turn on my A/C unit my check gauge light comes on plus I get a warning buzzer, and my voltage gauge shows not charging, with an external voltmeter in line voltage shows 0 when I turn the A/C unit off and bring RPMs up to 2,000, voltmeter shows charging at 13. Volts again
Any idea what is going on?
Thanks
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Wednesday, July 27th, 2022 AT 5:08 PM

3 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

It sounds like the alternator is not performing under load.
To figure out if it is indeed a bad alternator, you will have to remove it and have it bench tested. Most auto parts stores have bench testers for alternators.

Here is a helpful guide:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

I have attached the alternator replacement procedure below for your reference.

Let me know of any questions.
Thank you.
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Wednesday, July 27th, 2022 AT 8:15 PM
Tiny
EDWOOSR667
  • MEMBER
  • 23 POSTS
Thanks for the info. I plain to go and have it checked out.
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Wednesday, July 27th, 2022 AT 8:47 PM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Sounds good, let me know how it goes.
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Thursday, July 28th, 2022 AT 8:42 PM

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