Alternator Charge the battery and power up electrical systems. Without alternator then your car won’t move and all electrical functions will be disabled. Actually alternators are used in modern automobiles to charge the battery and to power the electrical system when the engine is running.
When the Alternator is failing then there might not be enough power in the spark plugs to keep the engine alive, which can cause it to stall for no reason while running, or to have trouble starting. Ignore this symptom and your car eventually won’t start at all.
Why alternator failed? One of the most common failure is the bearing failure. The needle bearings that allow the rotor to spin freely inside the stator can break down from dirt and heat. When the bearings fail, the rotor will not spin efficiently and can eventually seize. Usually an alternator with bearings failure makes a loud grinding noise.
Click here to check details on alternators an possibly the one that you need for a replacement because a bad alternator will bring disaster. Have a quick look here.