Question about 2001 Mercury Sable

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Alternator How do you know when your alternator is bad?

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Typically when the alternator is no longer working the battery light will be displayed on the dash. There are occasions where this will not happen. The best way to check is to use a voltmeter. Start the vehicle and check voltage at the battery. You should see more than 13.8 volts and better yet more than 14 volts.

Posted on Jul 25, 2013


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How do you know if alternator is bad on a 2006 hyndai sonata v6

Using a volt meter check the voltage at the battery with the vehicle running. There should be more than 13.5 volts. If it is more like 12 volts or less that the alternator is not working or there is an open between the alt and the battery. The most common cause of the battery light is a bad alternator.

Oct 08, 2016 | 2006 Hyundai Sonata

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Battery light is on starter and alternator are working

first,what kind of car? second,how do you know the alternator is working?let me tell you how the alternator and the battery light works. the bulb receives ground from the alternator when the alternator either isnt spinning or if the alternator is defective,so when the alternator is spinning and said alternator is in working condition, the alternator sends power to the bulb,and with no ground,the light goes out, so,to answer your question, install a reman or new alternator because your is bad.

Aug 11, 2014 | Cars & Trucks

1 Answer

Alternator in my 4 cyl Hyundai Sonata has new alternator and when put back on alterator check is still says it's bad, could it be relay?

try this! start vehicle, while it is running remove the negative cable from battery. if it stays running the alternator is good. make sure battery connections are clean and tight. if checking alternator at battery, and you know its charging. then it has to be a short in wire from the alt. if the engine dies when testing as above. its either a bad alt, or a bad wire. or bad ground. good-day!

Dec 09, 2012 | Cars & Trucks

2 Answers

93 Grand Marquis battery light stays on

First I would have to ask who is "they" that say your alternator is good? If you are talking about parts store counter people, they probably wouldn't know a bad alternator if it bit them in the face. Also, has the alternator been tested on the vehicle? Or are you removing it and taking it somewhere to get it tested? If you are removing it, this is NOT a good test.
It may tell you if the alternator can produce voltage, but does not tell you how it is going to act under actual (load) conditions. It also does not test the circuits in the car that are required to make the alternator work.

If the battery light is staying on, the alternator is not charging...PERIOD!
Now, it may be the alternator is bad or it may be that the circuits in the car that go to the alternator are bad. In either case, proper diagnosis will be required to find the cause of your problem.

Please also review the article at the following link:
What Else Could Be Wrong?

Jan 31, 2012 | Cars & Trucks

3 Answers

2001 Sebring. Dies immediately after removing jumper cables. Died while driving and no power at all unless on the cables. Alternator or other computer problem???

If you have everything electrical shut off? You should be able to run it without the battery with the charge from the Alternator. Your alternator is bad. replace it. That is a test that mechanics do to test an alternator. They try a fully charged battery to start the car then remove the positive terminal it should continue running. If it doesn't? You know you have a bad connection on the alternator or a bad alternator.
Please leave a great comment for me. On here.

Jan 07, 2011 | Chrysler Sebring Cars & Trucks

1 Answer

Alternator How do I know if my low battery

first of all, check to see if you have at least 14 volts when running. check at battery, this is the alternator voltage. with car off you should get at least 13 volts at battery. if battery is below 13 volts.after this test then battery is bad. if running and you get less then 14 to 14.3 then it is the alterrnator that is bad. make sure everything is off!

Apr 14, 2010 | 2001 Jaguar S-Type

2 Answers


mechanical water pump? is your alternator still on the car? belts still intact?


Feb 19, 2010 | 1993 Cadillac DeVille

1 Answer

1993 dodge caravan, over charging, replace the alternator, was tested and told it was bad, still over charging. Was told that the computer controls the voltage output, do I replace the computer system now,...

The computer has NOTHING to do with the alternator output.
The alternator is self regulating, with diodes, and rectifiers.
If the alternator is over charging it is because your battery is not accepting the charge, so the charger works harder and produces more to charge it, up to a point.
Was the alternator that you installed new or rebuilt ?
It could be another bad alternator.
Please let me know.

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3 Answers

How do i know if the alternator belt or alternator is bad

You are referring to the Serpentine Belt. you can check that simply by pressing down on the belt between two pulleys, if you can press the belt down more than a half in, the belt is stretched and needs replacing. also check the edges of the belt for cracking, that will also need replacement.

As for the Alternator, start the car. If the car dies within a few minutes, its bad. You can also take just a standard Volt meter while the car is running, and attach the volt meter to the battery. If you get anything less than 12-15 volts the alternator is not functioning properly and needs attention.

PS When using the Volt Meter, make sure its on DC setting and set it to the 20 volt setting,

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2 Answers

Bad wiring to alternator

I need more information please, bad wiring... not enough will need to know more, such as, The wires to the alternator are bad, previous owner did a bad wiring job to the alternator, or i messed up the wiring to the alternator and need some advice.

Jul 30, 2008 | Toyota T100 Cars & Trucks

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