Toyota Sienna battery not charging despite new battery and alternator replacement on Toyota Sienna

Some Toyota Sienna owners report experiencing issues with their battery not charging even after replacing both the battery and alternator. These owners often find that corrosion and loose connections at the battery terminals can hinder proper charging, while verifying the continuity of cables connected to the battery is essential to rule out connection problems. Additionally, inspecting the alternator fuse is crucial, as a malfunctioning fuse can prevent the alternator from operating correctly. Some owners also encounter issues with the voltage regulator, which can affect the entire charging system. Despite new components, underlying issues related to the State of Charge may persist, and many report that the battery light indicates system voltage is not within the expected range of 13.5 to 14.5 volts when the engine is running. Furthermore, measuring the voltage across the battery before and after starting the vehicle is recommended, as it should be close to 14 volts with no load. If these problems continue, consulting a professional mechanic is advised for effective diagnosis and resolution.