If you experience dimming lights, poor heater function, and a dying radio
while driving, then there’s a chance your alternator is failing. If your battery
constantly loses its charge or your car has slow engine turnover, those are
also good signs that your alternator may be on its way out
Here are signs of a failing alternator
1. Low voltage readings on your dash gauge.
2. Dimming of headlights at night with other accessories running.
3. Battery overcharging, and a dead battery which makes the car or truck
unable to restart.