Question about 1991 Honda Accord

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The alternator is not charging the battery. Has been replaced. Has ignition power. It's running directly off the battery.

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If the alternator checked good, check the battery. Sometimes when an alternator goes bad it takes the battery with it.

Posted on Aug 19, 2008

Voltage goes up and down

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To be sure, most major parts stores offer a free check of your battery and charging system. It must be a bad alternator, they can confirm that, and sell you one, or install it for you.countrycurt0

Posted on Aug 10, 2008

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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

2 Answers

Car has no power


the battery must be flat , try a jump start or get a new battery , when you have got engine running get the alternator charge rate checked as could be the reason for flat battery, if charge rate is ok then check to see if anything had been left on whilst car was left

Jul 11, 2014 | 2000 Hyundai Elantra

1 Answer

No power from alternator to battery


Is the battery ignition light coming on when you turn the key on. Wiring for an alternator is quite simple, the 60amp cable (thick wire) is a direct feed to the battery. The thin wire (normally blue) connected to the 'ing' terminal gets a live feed via the battery ignition light. if the bulb has blown or this wire is not connected, the alternator will not charge. If you can, use a 12v 5watt test light connected to the battery, start the engine and touch the 'ing' terminal. this should prove and energies the alternator to start charging.

Jan 21, 2014 | 1985 BMW 3 Series

1 Answer

Doge neon keeps diying


It can be your alternator. Did you know that when the car is running, the alternator is meant to be the sole source of electricity to run everything? The battery is only there to initially power up the car and crank it over. Once started, the alternator takes over supplying power to run the car.and charge up the battery .But if the alternator is not working, the battery supplies the power till it runs out of sufficient voltage, and the car will die.
Does your alternator/battery light go off as it should, after engine is running? If not, you have a charging malfunction and need to test the alternator If the alternator is good and is charging the battery back up every time it runs, then you have an ignition problem, not a battery or alternator problem.
Good luck, and hope you find the problem.

Jun 02, 2012 | 1995 Dodge Neon

1 Answer

I have a 1984 dodge D150, not charging, battery is good,charges with charger\r\ntruck starts and runs pretty good,but is running off of battery, NEW altenater,regulator,and belts belts are tight,replaced...


The first thing you need to do is stop wasting your money by replacing parts. Then get a volt-ohm meter and a test light to test the circuits between the battery, the alternator, the ignition switch, the starter relay and the voltage regulator. (a.k.a. Charging System Circuits)

To start, the "B+" or "BATT" terminal on the alternator (large black wire) MUST have a solid, direct connection to the battery. Check for the proper voltage here. Then, the red wire on the alternator at the "F2" terminal should be HOT at all times. If not, you probably still have a bad fuse link that you missed. The "F1" terminal on the alternator (Light Green wire) is known as your "FIELD" wire. It comes from the "IG" terminal at the voltage regulator. It should be hot any time the key is in the ON position. If not, your voltage regulator is not working or your ignition switch is not providing power to the regulator. Finally, The "F" terminal (Red wire) at the regulator should be hot any time the ignition switch is in the ON position. This actually gets it's power from the starter relay, which gets its power from the ignition switch.

Please also review these articles:

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My Car Won't Turn Over

Jun 12, 2011 | Dodge Ram 150 Cars & Trucks

2 Answers

I have a 2000 Ford Focus. One week ago the battery light came on and stayed on for two days when the voltage drained and left me stranded on the side of the road. I took the alternator to a rebuild shop...


Sounds like the alternator is still not making the correct voltage to charge the fully. The battery light comes on when the alternator doesn't make enough voltage to charge it. Your alternator might still be charging, but not putting out required voltage. I would have your alternator & battery tested. Hope this helps you.

May 27, 2011 | 2000 Ford Focus

1 Answer

Our car just dies out all of a sudden and it sounds like the car wants to start. Then we boost it for awhile maybe 30 mins to an hour to finally start then it will start good for a couple of days. Then do...


Its dying because the battery is not being charged, and it takes power to run the ignition pak to run motor and electrical systems. I would have the alternator checked out as that seems to be the most obvious problem,only other solution is battery will not take a full charge. usually if the alternator is charging it will supply the power to run the car, but if the battery wont take a charge then it will not have enough power to start the car or run the voltage that the ignition needs to operate. solution is bad battery or bad alternator.

Jan 13, 2011 | 1997 Dodge Neon

1 Answer

I have a 2007 silverado i have had this problem 2 times now. I have no crank and no start, but i have power everywhere else. They replaced the battery the first time last week.


Could be a combination of things, they put in new battery but did they test charging system (Alternator) Your alternator might not be charging properly and you've been running on battery power. You've probably run the battery down so low that there's not enough power to run ignition but enough for lights etc. Jump start and bring to repair shop that you frequent and have them test your charging system.

Jan 03, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Alternater does not charge batt. the battery light does not come on


If the battery light does not come on that doesn't mean the alternator is good.

If when you first turn the ignition key on and the car is not running, the battery light should go on to test the alternator. This is wired directly to the alternator circuitry.

When you start the car and it is running, this light should go out in a few seconds.

This indicates that it is charging the battery or supplying enough voltage to the car's system to keep it running.

If the battery light never goes on, the alternator is bad.

Aug 03, 2010 | 1995 Nissan Pathfinder

1 Answer

2000 Dodge Ram cargo van trouble starting and once started will not keep running tried jumping battery and no change what should we try next?


Sounds like the alternator is bad (not charging). If your battery is good/charged it should run until the battery is drained. If the battery is bad/not charged the car will die as soon as the cables are taken off as there is not enough juice to run the ignition system. If the alternator is good (but battery bad) the car would still run as the alternator makes power to run the car but becasue the battery is dead/drained there is no power to start the car (hense needing the jump). Have the alternator/charging system tested

Aug 09, 2009 | 2000 Dodge Ram 3500

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