ASE Master Tech Explains: Battery Light On While Driving, Causes and Fixes

About this video

COMMON CAUSES OF THE BATTERY LIGHT:
Failing alternator or worn alternator brushes
Bad voltage regulator
Broken, loose or glazed serpentine belt
Failed belt tensioner or idler pulley
Corroded or loose battery terminals
Bad battery cable or ground strap
Blown fusible link or charging system fuse
Failing battery that cannot hold a charge
Wiring fault in the alternator harness

SYMPTOMS THAT SHOW UP WITH IT:
Dimming or flickering headlights and dash lights
Slow or erratic power windows and wipers
Radio cutting out or resetting
Whining or grinding noise from the alternator
Squealing belt on startup
Burning rubber or hot electrical smell
Engine stalling and refusing to restart
Voltage gauge reading below 13 volts with the engine running