The battery light means the charging system has a problem, not the battery. First of all, use a digital voltmeter to measure the voltage across the two battery terminals while the engine is running. It must be between 13.75 and 14.75 volts. If it is below 13.5, it will not fully charge the battery while driving.
If you do find low voltage, the most common cause is worn brushes inside the alternator. They can be replaced, in some cases without removing the alternator from the engine. Also check that the pulley is actually spinning. Since it was making noise, the bearings could be seized. Usually the belt won't last very long when this happens, and it could be related to the belt coming off.
Caradiodoc
Friday, August 21st, 2020 AT 9:31 AM
(Merged)