Ford Expedition battery light on with no charge despite alternator and battery replacement on Ford Expedition

Some Ford Expedition owners report experiencing issues with the battery light remaining on even after replacing both the alternator and the battery. These owners may find that a faulty new alternator could still be preventing proper battery charging. Additionally, concerns with the electrical system, such as corrosion on connectors, damaged wires, or bad ground connections, can contribute to the persistent battery light. Some owners also note that a slipping or loose serpentine belt may hinder the alternator's ability to charge the battery fully. Furthermore, the vehicle's computer system might be detecting low voltage levels, which can trigger the battery light to stay illuminated. Lastly, using an alternator that does not meet the vehicle's specifications may lead to ineffective battery charging. For those facing these issues, it is advisable to have the vehicle's electrical system inspected by a qualified mechanic to identify and resolve the underlying problems.