Alternator light keeps coming on and then will go off for the past four days

Tiny
GLHUSTAK
  • MEMBER
  • 2009 PONTIAC G8
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 83,000 MILES
It has a new battery, I had it checked three times at different auto parts store, and they say both alternator and battery are good.
Monday, May 30th, 2022 AT 12:27 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

Was the alternator tested when the light was on? Also, are the battery terminals clean, tight, and free of corrosion?

Do me a favor. When the light is on, I need you to check the alternator output. Here is a link that explains how it's done. You will need either a voltmeter or a multimeter. Do this and let me know the results.

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

I will watch for your reply. I'm suggesting this because it seems the alternator may be in the process of failing. It may have been doing the job when it was being checked.

Let me know.

Joe

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Monday, May 30th, 2022 AT 8:21 PM

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