Dim or flickering headlights
Battery warning light on the dashboard
Slow or weak power windows, radio, or accessories
Dead battery that keeps coming back after charging
Engine stalling or difficulty starting
Whining, grinding, or squealing noises from the alternator area
Burning smell from overheated wiring or components
Electrical issues that get worse when more accessories are turned on
Battery voltage below normal when the engine is running
Corroded, loose, or damaged alternator or battery connections
Belt that is loose, worn, or slipping
Repeated need for jump-starts
Visible damage or excessive wear on the alternator
Test results showing low charging output