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Check the voltage at the battery with the engine running. You should read 13.5 to 15.5 volts. Any more or less is a good sign the alternator is defective. Of course if the alternator is making a squealing noise either the belt is loose of the bearings are failing. Take the vehicle to any auto parts store and they will check the charging system for free.
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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 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
What causes your alternator not to charge?
A bad belt, a bad regulator in the alternator or bad brushes in the alternator.
How can you tell if your alternator is bad on a 1995 Ford Bronco?
Start the car, unplug the battery the alternater should power the car. If it dies the alternator is bad. You can also get it checked at any parts store.
How can you tell if your alternator is bad on a Subaru Outback?
The quick easy method for determining a bad alternator or at least to find out if it is charging, while the car IS running remove the negative battery cable from the battery, if the car stalls then you need to have the alternator service inspected.
How do you tell if Alternator is bad?
Get engine running. While the engine is running disconect the POSITIVE termninal from the battery. If the engine dies, the Alterntor is bad.
Can anyone tell me how to tell if the alternator is bad or going out on my 1993 silverado?
Perhaps thids might help... http://wiki.answers.com/Q/How_do_you_tell_if_the_battery_or_the_alternator_is_bad
How do you tell alternator is bad?
The best way is to drive it to your nearest auto parts store and have it tested. You can test it somewhat yourself. Start the engine and use a volt meter to test the voltage that is being supplied by the alternator for the battery. If it is less than 13.5 volts the alternator is bad.
Why isn't your Mazda truck alternator not charging your battery?
bad alternator, bad voltage regulator, bad battery, bad connections.
How can you tell if your alternator is bad on dodge grand caravan?
Start engine and measure volts at battery, it should be at least 13
Can the bad alternator cause the water pump to good bad?
The alternator is belt driven and so is the water pump but that is where the correlation ends. There is no way a bad alternator could cause a water pump to go bad unless the alternator pulley was warped. Then there is a small chance.
Why wont alternator charge on a 1968 bug?
alternator is bad
