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Why would your fan belt and alternator stop turning the engine still running?

The fan belt and alternator are not directly responsible for turning the engine. The engine is turned by the crankshaft, which is connected to the pistons. The fan belt and alternator are driven by the engine, and they provide power to other components of the vehicle, such as the cooling system and the electrical system. If the fan belt or alternator breaks or fails, it will not cause the engine to stop turning.