Question about 1999 Jeep Cherokee

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Battery charging problems

Alternator charges sometimes and sometimes it doesn't. had alternator checked its good.

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  • afm420 May 16, 2009

    unfortunately it was my alternator. got it back up and running

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  • Jeep Master
  • 1,348 Answers

Check all connections very carefully.
the alternator may change when hot,so heat it first and then check it

Posted on May 15, 2009

  • kirtec auto May 16, 2009

    glad you found the problem.

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  • Jeep Master
  • 599 Answers

Check all leads coming from the battery with an ohm meter, should read zero, no resistance, make sure you do this test with the battery dis-conected otherwise you can burn out the meter or the fuse in the meter. if you need more help get back to me.

Posted on May 15, 2009

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4 Answers

Already replaced new battery, new alternator, fuse, and pt connector - voltage sits at 12.9 running - system still not charging?


It isn't a good idea to disconnect the battery while it is running as the resulting voltage surge can damage electronics. Obviously if it isn't charging there won't be much of a surge...

Some alternators are mounted in rubber to cut noise and vibration. This type needs a ground wire which is sometimes forgotten during replacement and sometimes the ground wire just breaks.

A standard alternator only needs two or three wires and sometimes a ground wire. If the direct connection to the battery is good, the ignition light wire intact and working and if needed a battery sensing wire (though this wire isn't often needed in the last couple of decades) the alternator, if it is any good, will charge the battery at the regulated voltage of about 14.5.
If you are sure the alternator is a good one and it isn't charging the connecting wires must be at fault and need to be checked.

There is one other possibility and that applies only in the case of smart charging systems. If your car has a smart charging system the alternator will have several extra wires, usually plugged into the side of the machine.
The alternator works in a similar way to the standard unit except instruction from a separate control unit is capable of reducing or suspending charging. The smart charge black box talks with the engine management black box and charging is suspended during acceleration to cut fuel consumption or improve acceleration. A fault in the smart charge system can prevent the alternator charging.

Disconnecting the additional wiring will allow the alternator to perform its normal function without interruption. The ignition, charge or battery light is controlled by the black box and can do strange things that mean nothing when the smart charge is disconnected.

May 03, 2015 | 2002 Ford Escape

1 Answer

Because the alternator is not charging


Hi can you clarify a bit more?
Have you had your battery checked? to confirm it is still good and holding its charge?
As for the new alternator, are all the cables from alternator to battery\ground clean and not torn or ripped?
Bring you car to an Autozone or type of auto store,sometimes they can do a free diagnostic check for you.

Jul 04, 2014 | 1999 Mercury Cougar

1 Answer

Battery doesn't charge


It doesn't affect the charging. Have your alternator tested. If it is good, check connections between alternator and battery, and check all fuses.

Feb 18, 2013 | Cars & Trucks

1 Answer

I have a 2001 galant v6 and my battery isn't being


The altinator is missing ground, any time you remove the battery and the engine dies, that only means that the altinator is not charging, there has to be a fuse for charging systme.

Sep 19, 2011 | 2001 Mitsubishi Galant

1 Answer

Truck isn't starting. Starter doesn't click when key is turned. Weak electrical - lights are dim and nothing comes on (radio,clock,etc) when I turn key to accessory position. Has had prior...


you have to have 12.4 volts showing on your battery to even attempt to start your car,, you need to completely charge the battery , ( if you have a walmart near you, they will not only charge it for you, but they run a Load test , which tells how the battery holds up under a Load , such as when trying to start the vehicle,, ) I would venture to say that you have a bad battery ,, it only take one bad cell to make it pretty much worthless, Plus the alternator is being over worked trying to charge it as it runs the car for you after starting,, ( note, never disconnect the battery when the car is running to check to see if the alternator is working, that will result in bad problems , such as computer stoppage) once your sure you have a fully charged, good battery in place, use a volt meter to check ,, start the vehicle and place the meter probe's on the battery terminals,, you should get a reading of no less than 13.5 volts, and should see that up to 14.5 volts on the meter, if you do the alternator is doing its job.

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2 Answers

The battery doesn't charge


the only possible reasons for this are, in order, a bad battery that will not accept a charge, bad alternator, bad connection or a problem with the engine computer module (rare)-check to see if the battery has 12.5 volts after sitting for a few hours, if it does, start it up and see if it reads about 14.3 volts after it has been idling for a few minutes-if the battery is less than 12.5 after sitting for hours, charge it up and have it load tested (free at most commercial auto stores). If it is good, see if your alternator is producing 14.3-replace it if bad... If both check out, clean all connections from the battery and alternator, and consider the possiblilty you have a drain on the electrical system that is causing your problems.

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2 Answers

Battery light is on...alternator showing low voltage


I never condem an altenater till I have the battery at full voltage.Make sure the battery hasa good 30 minute slow charge then load test it.If it is good most likely bad altenater.

Feb 18, 2011 | 1992 Oldsmobile Ninety Eight

2 Answers

Hello my name is Christina I have a 2005 Ford Explorer and my check charging system light keeps on coming up. I changed the alternator 2 to 3 times already I have had the car for about one year and half....


It seems like there is most likely a bad connection between your alternator and your battery I would look into replacing those wires. That is far more likely than that many bad alternators.

Oct 05, 2010 | Ford Explorer Cars & Trucks

1 Answer

Sometimes alternater does not charge battery


Drive the car to the auto parts store and have them test the battery and alternator for proper charge.  You probably just bought a dud, even though they are new.  Doesn't happen much but does happen.

Jan 02, 2009 | 1983 Oldsmobile Delta 88

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