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The alternator is here to give power to / recharge the battery while the engine is running.
the alternator, when wired correctly isn't charging with the engine running, then you can tell it is not working anymore.
how to know : ideally you'll need a volt meter to controle voltage on the battery +/- plug while engine is doing ~1200rev.
bit more elaborated : follow the + cable from the battery to the alternator connection, then with the engine running mesure voltage between the alternator connection and any negative ( - ) spot that you are 100% sure of (i.e. the head of a bolt screw onto the car)
a good alternator will give you a reading around 14 for a 12V system (most popular)
What happen when the alternator is not working properly : Your battery keeps on diying.
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∙ 12y ago
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How do you tell an external from an internal regulator on an alternator?
In most cases if it is an alternator then it has an internal regulator
How can tell if the battery is bad or the alternator?
Take the battery to a parts store so they can test it.... Actually you need to test both the battery and the alternator because if your alternator is not functioning correctly it can drain the battery of power... so just testing the battery may only tell you that you have a drained battery and not reveal the cause... This testing can be done using an Auto meter which tests the battery and also does an alternator load test...If you do not have a tester you can rent one from an auto parts store,or you can remove the alternator and take it to the auto parts store and have it bench tested along with the battery...usually for free...
What causes the alternator to stop working?
How to Tell If Your Car Alternator Is Bad Check related link below…
How do you tell if the alternator is outon a 1999 kia spehia?
A quick way to tell if there might be a problem with an alternator is to remove the positive side battery cable from the battery while the vehicle is idling. If the engine dies, odds are there is an alternator problem.
How can you find out which alternator you need?
Any auto parts store where you will go to buy a new alternator can tell you what you need.
How do you tell if the alternator is seized?
Seized should mean that it's not turning. Crank the engine and see if the alternator pulley spins or not.
Where is the alternator on a Pontiac fiero gt?
The alternator lives low on the passenger side rear of the engine. Repair and adjustment done from underneath
What is P0622 neon 2000 can you tell me more about?
Something to do with the alternator.
How do you tell if your alternator is bad in your 1996 dodge neon?
you could pull off your positive battery cable if it stalls out then you alternator is the problem
How do you tell if it's the alternator or battery?
Have a shop load test the battery.
How can you tell if an alternator is 80 or 100 volts?
Connect a voltmeter to the alternator and start the engine. An automotive alternator should read aprox 14.5 Volts when it's running and the battery is fully charged.
Had to change alternator now having trouble with PCM what do you do?
It is possible that the alternator caused damage to the PCM. Best to have diagnostics done on the car to see if and where the problems are.
