Hello,
The stalling issue that you are having does sound like due a weak alternator.
It will be good idea to get the alternator tested. It might not be producing enough power to the battery.
The alternator should produce 13.6V to 15.2V, to the battery with the engine running.
Here is a helpful video of how to test the alternator:
https://youtu.be/Z-p4dMJUpUw
https://www.2carpros.com/articles/how-to-check-a-car-alternator
Keep in mind that if a faulty alternator can make the battery go bad as well. As the battery is not designed to be draining and recharged over and over.
I have attached diagrams for your reference.
Please let me know of any questions.
Thank you.
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Thursday, September 23rd, 2021 AT 8:57 PM