Okay. We need to do a couple things. First check for codes. I am going to assume there are none.
Next we need to test the alternator and not just replace it or rebuild it. We need to see what it is producing so we can take the correct path. Then we need to make sure there are no draws on the battery.
Just so you are aware this vehicle has what is called a PCM control regulator. Meaning the voltage regulator is in the PCM and not in the Alternator. This means the alternator only puts out the amount of voltage it is told to by the PCM.
If we can prove out that the alternator and battery are good on their own with these tests then I would suggest replacing the PCM as the regulator has most likely failed.
Let me know if you have questions and what you find. Thanks
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Monday, August 3rd, 2020 AT 3:53 PM