You can try removing the serpentine belt and running the car briefly like less than a minute.
Also try moving the pulleys by hand including the alternator, checking for grinding or hard to turn. Water pump and crank pulley should be the hardest or almost impossible to move by hand. Rest of the accessories should spin relatively smoothly by hand.
One good way to tell where a noise is coming from is to take a piece of tubing and hold it against various parts and against your ear listening for the part that loudest emits the sound.
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