Why Battery Light On when the Alternator is Charging - Reasons and How to Fix It

Why Battery Light On when the Alternator is Charging - Reasons and How to Fix It. Car Battery Light On but Alternator is Charging or Alternator Charging But Battery Light On - Causes and Fixes. Introduction: If your vehicle's battery light stays on despite testing the alternator and confirming it's charging, let's review some possible causes and how you might fix them. So, what could be causing this issue? There are several possibilities... Timecodes: 00:00 - Current Issue 00:14 - Alternator Low Voltage Output 00:50 - Bad Voltage Regulator 01:19 - Intermittent Problem 02:11 - Bad Battery Sensor 02:33 - Bad Battery 03:01 - Bad Wiring Connections 03:31 - High Amp Load 03:59 - Blown Fuse or Warning Light Malfunction 04:29 - Bad Onboard Computer 04:58 - Like, Comment, Subscribe