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The distributor is driven by the camshaft and transfers the current from the ignition coil to the spark plugs in each cylinder of the engine. The distributor cap has the output contacts that connect the distributor to the ignition wires and protects the distributor's internal parts. On older vehicles, the distributor is the heart of the ignition system. Most modern equipment or vehicles are built without a distributor as individual coil packs have taken their place. Symptoms of a faulty distributor are shaking of the equipment or vehicle while operating, difficulty starting the engine, or a high pitched squealing noise when the vehicle is started. These are often caused by the rotor not rotating properly within the distributor cap. Faulty distributors should be replaced to ensure proper ignition timing, voltage to the spark plugs, and firing of the ignition coil.