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To check the charging system of a Yamaha Big Bear 400, start by inspecting the battery voltage using a multimeter; it should read around 12.6 volts when fully charged. Next, start the engine and check the voltage again; it should rise to about 13.5 to 14.5 volts if the charging system is functioning properly. Additionally, inspect the wiring and connections for any signs of wear or corrosion, and ensure the rectifier and stator are working correctly by testing their resistance according to the service manual specifications.

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