Question about 2002 Chevrolet Malibu

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2002 Chevy Malibu battery light keeps coming on the battery is a year old the alternator about 6 months old what could this be from ?? What can I do at home to check these with no voltage testers ?

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If the light comes on and stays on: check that the battery terminal connections are tight, the alternator drive belt is tight. Borrow a volt meter, set to 20 Vdc and check across the battery terminals while running (should be 13 to 14 volts), if voltage is low, the alternator is not charging. Many auto parts stores will check your system for free (remember they are looking to sell a battery or alternator).
If the light only comes on occasionally: check for parasitic voltage drains (GPS or cell device plugged in, security system, interior light stays on (check at night) after engine is shut off).

Posted on Apr 18, 2015

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Hello Lewis, The only thing that I can think of is to check to make sure the belt that drives the alternator is tight.

Posted on Apr 18, 2015

  • Lewis Durham
    Lewis Durham Apr 19, 2015

    Thank you I tested the voltage with my buddy's tester and it was reading 11.8 turned out the alt was a dud so it was replaced for free bc it was only 5 months old and still under warranty thank you for responding !!

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Posted on Jan 02, 2017

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SOURCE: Chevy Malibu Check Battery Light

the problem with my malibu was the plug going to the alternator. i went to the junk yard and cut a plug end off the wiring harness and replaced it on mine and it's been working fine. i don't know why it drains the battery with the broken wire in the plug, but it did. i found the problem by wiggleing the wire while my wife watched the dash for the battery light to go out. ken!

Posted on Oct 28, 2008

freetek
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SOURCE: 2002 chevy malibu catalytic converter

You probably have way too much unburned fuel in your exhaust system (how's your mileage?) or possibly a failed oxygen sensor that is giving false information to the computer.

Posted on Feb 20, 2009

  • 1162 Answers

SOURCE: Low voltage, the battery runs low when running the car

What is the voltage you are reading? Is it below 13.2 or so? Also have you checked the current with the engine off to see if something else is working that should not be on. I ran across this twice while working on a truck and car. A relay that was wore out keep trying to close and would drain the battery every couple of months. Sometimes you can hear them clicking or buzzing. Touching them sometimes they are warm or real hot. But that is not a sure sign it is bad. In my Trailblaze they get hot but are ok. Another thougth is the belt on your alt, correctly set to spin it at the right voltage. I have ran across this many times lately with serpatine belts.

Posted on Aug 04, 2009

GARYca
  • 672 Answers

SOURCE: 2000 chevy silverado 1500 battery light keeps

When was the alternator replaced? was it a remanufactured alternator? This is common on GM trucks, fluctuating voltage is caused by a faulty alternator voltage regulator. Have the alternator tested, strong possiblityits defective!!Hopefully this helps!!

Posted on Mar 15, 2010

jsmes1027
  • 749 Answers

SOURCE: 2002 Chevy Malibu. ABS light

The abs light will reset every time the vehicle is shut off. The most common cause of the abs light coming on is a bad wheel speed sensor. A scan tool would be the option to locate the fault in the abs system.

Posted on Jun 01, 2010

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1 Answer

Why does the battery light come back on after replacing both and alternator?


Have a auto electrician check that the 14.2 volts is actually dc current as it if it is ac then there is a problem in the rectifier of the alternator

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-Sounds like the alternator no produce enough power.
-Start the car and let it runs for 10 minutes to temperature then check voltage at battery. You should get 14.5 volt or +/-. It less then
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Charge the battery start the engine and confirm that the voltage at the battery is about 14 volts with engine running . If not it is likely the alternator is bad or the electrical connections from the alternator to the battery are defective.

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If it is under 12 and continues to drop trouble shoot for battery drain. If you suspect the radio pull the fuse and observe.

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Does the starter make any noise or click when you turn the key to start? If it does not, chk. battery could be bad, and battery cables could be loose or corroded. If there good and clean and battery is good try tapping starter see if it will turn and start if it does or still clicks starter bad. It could be ignition switch if it does nothing at all, but if it clicks most likely its starter.

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