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What is the main drive wheel on a serpentine belt 2000 ram van?

On a 2000 Ram van with a serpentine belt, the crankshaft pulley is the main drive wheel for the serpentine belt system. The crankshaft is driven by the engine, and its pulley then drives the serpentine belt, which in turn powers all the accessories (alternator, power steering pump, air conditioning compressor, etc.).