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Battery light and battery not charging on 02 envoy. Bsttery is new and alternator tests good.

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  • Cars & Trucks Expert
  • 126 Answers

On these vehicles the charging system is controlled by the PCM / the cars engine computer. would need to check if you are getting a signal from there to turn on the alternator. i have seen in the past where the connector at the alternator has broke or is loose. But i also have seen when the Stepper motor on the instrument cluster goes bad the gauge shows it not charging and the battery light will come on. if this is the case then you should give this company a shout.

southernelectronics.com

Posted on Apr 21, 2015

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6ya6ya
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Posted on Jan 02, 2017

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  • 12 Answers

SOURCE: Charging system

change your battery cables and check all wires on the alternator for loose connections, expecially the grounds.

Posted on Oct 12, 2008

  • 193 Answers

SOURCE: Charging Light On After Replacing Alternator/Battery1999Windstar

Hi, I can't tell you exactly what is wrong because there is too much involved at this point, what with 2 shops working with it, but I can give you some advise on what else to check. On the alternators and the wiring that supports them a small volt charge is taken off one of the slip rings, where the brushes ride, for the purpose of turning out the light. As I remember, this is a yellow wire that runs back to the dash.

To the alternator, it would be one of the wires that plug into the side of the alternator case.
jetski

Posted on Nov 27, 2008

csmock132
  • 4669 Answers

SOURCE: Battery dosn't charge, alternator/voltage adapter test's good.

Did you test the Alternator on or off the truck? It might be a problem with the control system to the Alternator. The regulator need a battery feed to work, It is usually ran through an alternator fuse.

Posted on Mar 11, 2009

wracefans24
  • 1985 Answers

SOURCE: 2001 Ford F150 battery light comes on at running

verify the belt tension-er is staying tight and not floppy around at higher RPMS,or the belt is not slipping ,have the alternator checked at higher RPMS not at an idle.the last is make sure the single wire little wire connector is tight

Posted on Nov 22, 2009

  • 580 Answers

SOURCE: 2003 Ford Focus battery light is on, but alternator appears good

Disconnect battery ground for 30 seconds & reconnect. Light should be out unless you have deeper diagnostic problem. Charging system good Battery good. This action should reset trouble light. Good luck!

Posted on Dec 29, 2009

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How to Test Vehicles Alternator?

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How to Replace Alternator? http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-alternator.html

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Alternator testing? http://schematicsdiagram.blogspot.com/2011/12/alternator-testing.html--------- Cars electrical system is pulsating? http://technoanswers.blogspot.in/2012/01/cars-electrical-system-is-pulsating.html------ 1998 Ford F150 pickup Battery Drains overnight due to Alternator? Alternator drains car battery? http://technoanswers.blogspot.in/2012/02/1998-ford-f150-pickup-battery-drains.html------- 2002 Ford Focus sits over night and battery goes dead? http://technoanswers.blogspot.in/2012/02/2002-ford-focus-sits-over-night-and.html--------- Charging system problem on Chrysler LHS car? http://technoanswers.blogspot.in/2012/02/charging-system-problem-on-chrysler-lhs.html---------- How to replace alternator 1997 Dodge Stratus? http://technoanswers.blogspot.in/2012/02/how-to-replace-alternator-1997-dodge.html------- How to replace Alternator on Mitsubishi Lancer http://www.howtorepairguide.com/2012/10/how-to-replace-alternator-on-mitsubishi.html
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1 Answer

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Sounds like you have a bad alternator. His car was what was keeping your going by supplying the power. When your alternator goes out, the car will only run off of the battery until that has drained enough to not operate all the electrical systems. The battery may still be good. You will have to have it charged and tested to be sure, but you may have to replace it as well.
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1 Answer

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