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SOUND LIKE ALTERNATOR FAULTY.HAVE VECHICLE BATTERY CHARGED OR JUMPED STARTED.WITH ENGINE RUNNING CHECK BATTERY VOLTAGE WITH ENGINE RUNNING SHOULD BE 13.5 - 14.5 VOLTS. IF NOT ALTERNATOR VOLTAGE REGULATOR FAILED.BUT FIRST CHECK ALTERNATOR FUSE AND CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE OR LOOSE CONNECTION.WHEN YOU TAKE OLD ALTERNATOR TO AUTO PARTS STORE LET THEM TEST ALTERNATOR FIRST.MAKE SURE YOU DONT HAVE ELECTRICAL WIRING PROBLEMS IN VECHICLE.
the voltage regulator is built into the alternator,have you check the alternator connector for damage or corrosion check with a test light for voltage at the red wire that plugs into the alternator that is in the 2 wire plug connector as well as check the large red wire for voltage as this wire is the feed wire from the battery.you don`t say if this is a new or used alternator.if you have a voltmeter that is the best way to check for the proper amount of voltage at the test sites.the battery must have a minimum of 12.6 volts to start with higher is better.to test the voltage regulator need the engine running and you need a voltmeter to tell properly if it is working.at the back of the alternator their is a hole that looks like the letter D this is where you use something like a cotterpin and insert it into the hole you should feel a tab,push lightly on the tab and ground the cotterpin to the side of the alternator using the voltmeter you should see the voltage start to rise and hear it start to charge.the battery voltage and the feed wire at the alternator as well as the smaller red wire at the plug connector should be the same.charging voltage should be about 14.5 volts.
A bad voltage regulator could cause the problem. Assuming the alternator is working correctly. Jump the vehicle with the battery disconnected and then disconnect the jumper cables. If the vehicle dies your voltage regulator or Alternator are bad, some vehicle have separate regulators from the alternator, if it continues to run the alternator is good but the voltage regulator is probably the cause.
If you havent replaced the battery I would start there. If the battery has a dead cell in it then it will effectively remove the charge that your alternator is putting out causing your vehicle to stop running because it has no power. I would jump start the car without the battery hook up and remove the cables and see if it runs that way. If it does you have a bad battery.
because aaa can jump start it and you can't sounds like maybe the battery cables are curroided (dirty)
in-between the battery post and the clamps, clean the battery terminals and charge your battery as a loose conection can run down even a new battery