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The charging system on your vehicle is computer controlled . The ECM - engine computer turn's on the battery light if it think's there is a problem . Sends a message to the instrument cluster over the class 2 serial data network . Have you had the vehicle checked for DTC's diagnostic trouble code's ?
Yes, it sounds like your alternator is short circuited internally. Replace alternator with high quality rebuilt unit
how does the alternater works
Alternator and Charging System
A battery is needed to power the operating system of your car. Once the vehicle is running the battery is charged by the alternator which is driven by the engine. While in operation the alternator creates electricity, about 13.6 to 14.3 volts, and recharges the battery to its original state of charge. The alternator is one of the hardest working electrical components in your vehicle. When your vehicle is running the alternator is busy creating electricity to provide the engine and the car accessories with needed power. When the car is not running and your battery is severely discharged some electrical components may still operate or operate poorly. Typically, these components are designed to operate properly at 12 volts; if the system voltage is low it can cause erratic symptoms.
to check out how the alternater looks . When jump started a severely discharged battery can cause the alternator to overload and internally fail. If this occurs replace the battery before replacing the alternator. This will help prevent a second alternator failure. Most vehicles use a multi-ribbed belt connected to the engine to rotate the armature inside the alternator. If the belt fails it should be replaced immediately. Belt tension should be taught. If it isn't, check the belt tensioner. It may need to be replaced or the incorrect size belt may have been installed. Either of these conditions can cause the vehicle to stall and not restart.
click the link http://www.2carpros.com/how_does_it_work/alternator.htm
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Check your owner's manual but they are probably indicating that the engine is badly overheating and the battery is either dead or not charging. You need to stop the engine NOW and determine the problem. A likely cause is a broken serpentine belt which will cause the engine to overheat (no water pump) and the battery to go dead (no alternator charging).
SOUND LIKE A DEAD BATTERY BUT CHECK BATTERY VOLTAGE SHOULD BE 12.6 VOLTS.IF NOT BATTERY DEAD NEED TO BE CHECK AND REPLACE.MAKE SURE BATTERY CABLES TIGHT AND BATTERY CABLES AND BATTERY POST CLEAN FREE FROM CORROSSION.AFTER REPLACING BATTERY MAKE SURE ALTERNATOR IS CHARGING BATTERY. WITH ENGINE IDLING BATTERY VOLTAGE SHOULD READ 13.5 - 14.5 VOLTS. MEANS ALTERNATOR IS CHARGING BATTERY. IF NOT CHECK ALTERNATOR FUSE AND CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES, MAKE SURE WIRES NOT FRAYED OR BROKEN. IF ALL IS GOOD MAKE SURE ALTERNATOR DRIVE BELT TENSION CORRECT.MAKE DRIVE BELT TENSIONER NOT BROKEN OR DAMAGE CAUSING DRIVE BELT TO SLIP OR CHECK ALTERNATOR CHECK ALTERNATOR PIVOT BOLT MAKE SURE NOT LOOSEN CAUSING TOO MUCH SLACK IN DRIVE BELT CAUSING BELT TO SLIP.WARNING TURN OFF RADIO FIRST BEFORE REMOVING BATTERY CABLES TO REPLACE THE BATTERY BECAUSE IF RADIO WAS LEFT ON WHILE BATTERY WAS DEAD WHEN YOU INSTALL BATTERY CABLES THE POWER SURGE WILL DAMAGE RADIO.
SOUND LIKE DEAD BATTERY.HAVE BATTERY CHECKED AND REPLACED.MAKE SURE ALTERNATOR CHARGING BATTERY.WITH ENGINE IDLING BATTERY VOLTAGE OUTPUT AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS. IF NOT CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE OR LOOSE CONNECTIONS,CHECK ALTERNATOR FUSE AND MAKE SURE ALTERNATOR DRIVE BELT NOT LOOSE SLIPPING OR BROKEN.
This warning light comes on when the charging system is NOT producing enough current or voltage to meet your vehicle's electrical needs. The cause may be a failed alternator or generator, a bad battery, a failed voltage regulator (if separate from the alternator), loose or corroded battery cables, or a broken or slipping drive belt. Turn the engine off and check the belt that turns the alternator. Caution: DO NOT get your fingers, clothing or tools near the belt(s) or pulleys while the engine is running. If the belt appears to be intact and is turning the alternator, start the engine, and turn on the headlights. If the lights are dim, it verifies the charging system is not working -- probably due to a failed alternator, battery or other electrical fault.
It is most likely your alternator. Your alternator failed and then your battery lost its charge. Have the battery charged and tested before you replace anything just to double check. Either way, the battery needs to be charged seperately. Don't try to charge it with your new alternator or jumper cables as this could burn up your new alternator.
The battery light trips when it detects an issue with the charging
system. Very rarely, the battery light can trip if there's an issue
with the PCM, but this is very rare.
Take a voltmeter with the car off and measure the voltage on the leads of the batter, should be
around 12V+-.2. With the car running, measure again and this time it should
read 13V-14V. If it does read 13V-14V then it means that the alternator
is working. If it is below 12V, then it means your alternator is not
charging the battery properly. If it's above 14V, then it means your alternator
is overcharging and damaging the battery.
+++ been told to fix blue smoke...piston rings gone .
Piston rings, valve seals are a good guess for cause of blue smoke. Engin oil additives for high-mileage engines can help the blue smoke problem... Pep Boys and the like -- many different products -- just make sure it's for stopping smoke, not cleaning engines...
+++ squealin....fan belt gone.
Has the alternator belt been tightened? If not, this could be causing both symptoms: dead battery & squealing
+++ battery light on...alternator gone.
Again, this could just be a loose belt, and most likely is the problem...