Ford Mustang charging system service message reappears after alternator replacement on Ford Mustang

Some Ford Mustang owners report experiencing the persistent "Check Charging System" message even after replacing the alternator, which may be attributed to several underlying issues. These owners have noted that a faulty or incompatible new alternator could be the cause of the warning message continuing to display. Additionally, battery-related problems, such as poor connections or a weak battery, can also trigger this alert despite the alternator change. Other components of the charging system, including the electronic control unit (ECU) or wiring, may be malfunctioning, contributing to the issue. Furthermore, some owners have encountered problems with aftermarket or remanufactured alternators that fail to provide the necessary charge sense signal, leading to dashboard warning lights. Incorrect installation of the alternator or associated components has also been reported as a factor. To resolve these concerns, it is recommended that owners conduct thorough diagnostic testing, seek professional inspection, consider using OEM parts for compatibility, and verify the entire electrical system to ensure proper functioning.