Just to be clear, you replaced the alternator, but the voltage is still dropping.
The way this works is that the PCM commands a certain voltage levels based on demand.
This means we need to start with checking the alternator and make sure we are not dealing with just a junk part.
We need to test the alternator and most parts stores can do this.
https://www.2carpros.com/articles/how-to-check-a-car-alternator
Once the alternator passes then we can monitor the field control voltage from the PCM.
Basically, the PCM will command the alternator to provide a certain amount of voltage. The fact that the light is on shows that the alternator is not doing it. However, it may not be due to the alternator.
Let's start with this and go from there.
Thanks
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Wednesday, June 1st, 2022 AT 1:51 PM