Ok, Check the voltage across alternator and also the voltage across the battery terminals. If your alternator is bad, your alternator voltage will tell you. This can be confirmed when you test you battery voltage. If battery voltage keeps going down, it means your alternator is not charging.
When this happens, you need to check the fuse in the engine compartment relay box. There are two big fuses, 75A and 100A, make sure they are both good. If they are both good, your alternator is toast. Time for a replacement
RINKU
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