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Alternator will not charge battery

New alternator and new battery. Check engine light is on.

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1 Answer

Need a repair shop-- don't you?
Or a different one than the one that left
you in your present condition of not
properly diagnosed & resolved.

Posted on Jul 20, 2013

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 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

  • 4 Answers

SOURCE: Battery not re-charging, replaced battery and alternator no luck

Here are a couple of ideas for you to try. First check in the power ditribution box under the hood, there is a fuse for the charging system, either use a circuit tester or just pull each fuse one at a time. Usually it is a 10 amp fuse as it is on my 94 cherekee. if you find any bad fuses replace them with same type and amperage. you should also check the fuse box on the right side of the dash, door has to be open for acess to the cover on the end of the dashboard, check all of those fuses also. If you live near an AUTOZONE auto parts store, take your jeep there and they can test your alternator on the vehicle , or you can remove it from vehicle and take it inside, they can bench test it. If you have a volt meter you can test it yourself, start vehicle, set meter to volts at least 20 or higher , place black probe on negative post on battery, red on positive, look at readout, a good alternator will put out 13.5 to14.0 volts, which is how much it takes to run vehicle and accesories and charge battery. If alternator doesn't put out 13.5 to 14.0 volts it is defective. I hope these ideas help.

Posted on Mar 25, 2009

dennymulford
  • 1055 Answers

SOURCE: why won't my new alternator charge my new battery

the power wire for that lays on top the intake probly has bad spot drawing out the current

Posted on Apr 08, 2009

  • 9 Answers

SOURCE: New battery & new alternator, still not charging...

Take it to another auto parts store to test to verify.
If you put a voltmeter on the battery when the T+C was running, it should read 14-15V.
It could have a bad diode. If this is the case the alt. will be pumping out AC instead of DC. This is BAD. Batteries do not like this and the battery will fail because of it.
Be careful in those 'auto parts stores'. I have found that they employ alot of 'kids' who know little about how a car works. Try NAPA. They are much more knowledgeable and professional. But they cost alittle more.

Posted on Jun 12, 2009

  • 60 Answers

SOURCE: installed new alternator and car battery still will not charge.

did you unhook the battery prior to installing the alternator

Posted on Jul 12, 2009

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95 Cadillac sts will not hold charge,new battery new alternator?


What's the voltage reading at the battery with the engine running ? 13 to 14.1 volts ? If not, it's not charging .Sounds to me like it's not charging ! Is there battery voltage at the heavier gage wire on the back of the alternator ? Does the battery symbol light on the dash work ?

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Check engine light is on


The check engine light could relate to something else - not your battery or alternator.

If your battery isn't charging from the alternator an illuminated battery symbol would appear.

It could be many things - low oil level, low coolant level, low windscreen washer fluid level. It could even be an electronic 'fault' - which a computerised diagnostic check would identify.

If the battery warning light is illuminated the first thing you should do is to check the tension of the alternator belt. You say that a new battery and alternator have been fitted? Take it to an auto electrician - he should identify any fault within minutes.

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2004 Chev Avalanche New battery but won't charge.. Starts fine but light says Battery not charging


Dear Joyce,
The "battery not charging" light actually will tell you many things, and that one light is affected by several parts of the car.
If your battery is new, then the light is telling you some other part of the charging system is failing or has failed.
The most common part is the alternator.
The alternator, or the voltage regulator which is built inside the alternator, can both fail, and the light is telling you.
Those need to be checked by a repair man. (mechanic)
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The regulator is inside the alternator. Get a new alternator or disassemble the alternator and install a new one. My option is get another alternator.

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Okay, so I bought a 2001 Ford Focus zx3 5 speed, and when I went to go test drive it, the alternator went (so I thought). anyway, he lowered the price, and I still got it and replaced the alternator. about...


your alternator is still under warranty get a new one, based on your info thats the problem, just make sure when installing the new one the battery polarity is correct because that is one cause of damaging the alternator, reversed polarity will burn regulator ic, once you have installed the new alternator run the engine on idle remove one of the battery connector if the engine still run it means the alternator is charging, if engine stops check wiring connection

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2004 Pontiac Montana -brand new battery, new alternator(not rebuilt). have to jump start and runs for a while then dies some times wont take charge. battery will die not running in a day. very intermi


First, you can't and shouldn't test an alternator by disconnecting the battery cable while the engine is running. You run the risk of cooking the alternator and the computer. Thats how we used to test generators back in the last century.
Is the check engine light on when the engine is running ? Is the battery charge warning light on ?
There should be a fuseable link between the alternator and the battery that could keep the alternator from charging the battery.
The ignition module would have no effect on the charging system.

Aug 07, 2012 | 2004 Pontiac Montana

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1995 explorer new battery new alternator battery light still stays on battery goes dead within-2 hours of driving any hints top look for?


Hello, the battery light on your Ford is controlled by the voltage regulator. If the light is on it's indicating the battery is not charging, and is being discharged. If you have a volt meter you can test at the battery. With the engine running the voltage should read at least 13.5vdc. If it's lower than that, the alternator is not charging, or the charge is not reaching the battery. Another simple test, is remove the negative battery cable, if the engine dies the alternator is not charging. Autozone will test your alternator and your battery for free, if you do not have any test equipment. If you just replaced the alternator and it failed the test, it should be under warranty. Same with the battery.

I hope this information is helpful.

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2 Dashboard lights have come on 1 check engine


well if the battery light came on that means your alternator is not charging the battery,,you need a new alternator,,,and maybe a new battery if it killed it,,,,that set the check engine light on,,,,,for it not charging,,,,,do not buy a aftermarket alt,,,,only saturn/gm,,as they do not meet gm/saturn specs and you will install it and still have a battery light on,,,,,,you need a factory alternator,,,yes it costs more,but unless you feel like putting a few in and out to find this out,,,,,

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Brand new battery,drove car about two days and the lights got very dim,stereo turned off,no accellaration,and now dead.(1994 mitsubishi mirage 1.8 liter)


It sounds like the battery has gone dead and will need to be replaced due to a bad Alternator. Once you get the car started, check the voltage on the battery, there should be 13.5 to 14.5 Volts. A fully charges battery should have 12 volts with the engine not running and once the engine is running there should be 13.5 Volts with the head lights on and heater on too. If there is less then 12 volts reading on the battery with the engine running, then replace the Alternator. You can pick up a Alternator at Auto Zone and they can give you the step by step instructions to replacing it with common tools and they can also check the Alternator in your car to before you buy the new one. Good luck and hope this helps and insect the wire harness from the battery to the Alternator, look for any sighs of damaged like corrosion and repair any damages to the wire harness.

Dec 14, 2009 | 1994 Mitsubishi Mirage

1 Answer

Just installed a new alternater and the battery gadge is reding discharge I had the battery checked and its good. Can you help


Check the 'Bat' / 'Charge'/ 'Alt' indicator on the dash panel lights when the vehicle ignition is switched on prior to starting the engine.
This indicator should extinguish within approx 1 second of starting engine.

If the indicator is not operating the alternator cannot provide charge current - check:-
1) the wiring connections to the new alternator,
2) the indicator lamp is not blown,
3) the alternator is properly grounded.

If the indicator light works normally, check the output voltage of the alternator is approx 14.5v when the motor is running.
If its about 14.5v, the battery should be charging.

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