Battery light comes on, alternator and battery checked out good

KSHAW57

MEMBER
2002 CHEVROLET MALIBU

Battery light cont. To come on, alternator and battery checked out good. Alternator get hot is there a fuse that control the output of amps. Battery light usually come on after driving for 5 to 10 miles. Only way to shut off battery light is to turn car off for a least 10 minutes then restart. Afraid alternator might start fire.

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

It sounds like the alternator is getting ready to fail due to the battery starting to go bad. What happens is the battery plates become oxidized and refuse to charge which overloads the alternator. Here are some guides that will ehlp you get the problem fixed.

https://www.2carpros.com/articles/how-to-replace-an-alternator

and

https://www.2carpros.com/articles/how-to-replace-a-car-battery

You will need to remove the serpentine belt first.

https://www.2carpros.com/diagrams/chevrolet/malibu/2002

Here is how to replace the alternator on your car (below)

Tighten

Tighten the generator bolts to 50 N.m (37 lb ft) .
Tighten the generator nuts to 30 N.m (22 lb ft) .

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken

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Tuesday, April 27th, 2021 AT 10:12 AM

DANIEL MARTINEZ2

MEMBER
2 POSTS

I was driving on the freeway & my car just lost power the meters on the dash started going up & down I press the gas it didn’t wanna go just to a limit my light where wearing off I took it to the shop they changed the battery & check the alternator he said it’s good but later on that day my battery signal went on in my dash so I pop the hood one my friends told me take off the negative wire of the battery while it running & the car shut off Completely I put the negative back on the battery & it started back up
2002 Chevrolet Malibu Ls

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Tuesday, April 27th, 2021 AT 10:12 AM

DANIEL MARTINEZ2

MEMBER
2 POSTS

I wanna know if it’s the alternator or not so I won’t buy wrong part

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Tuesday, April 27th, 2021 AT 10:12 AM

KASEKENNY

MECHANIC
18,907 POSTS

The battery light could be caused by the battery light, but we need to find out how the tech tested the alternator. Here is a guide to either ask the tech how he tested it or have it performed as such:

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

The other thing we need to question is the voltage regulator which is part of the alternator/generator.

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