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Have you checked the alternator? It sounds like it is failing. Do me a favor, since voltage was so low when the engine was running, first make sure the battery terminals are clean and tight,. Next, fully charge the battery. If you don't have a charger, remove the battery and have it charged at a parts store. If you take it to a parts store, have them load test it to confirm it is good. If the battery is good, reinstall the battery and check for alternator output. Here are links that will walk you through everything I just suggested. Do this and let me know the results.
You will need a volt meter or multi meter for checking the alternator.
Based on your description, I have a feeling the alternator has failed. If you can't check it at home with the link I supplied, remove it and have it bench tested at a parts store. Most will do it for free.
Here are directions for removal and replacement of an alternator:
If it is the alternator, here are the directions for replacement specific to your vehicle. The attached pictures correlate with these directions.
1. Make sure you have the anti-theft code for the radio, then write down the frequencies for the radio's preset buttons.
2. Disconnect the battery negative cable, then disconnect the positive cable.
3. Move the auto-tensioner (A) to relieve tension from the alternator belt (B), and remove the alternator belt.
4. Disconnect the condenser fan motor connector (A) from the condenser fan shroud.
5. Remove the condenser fan/shroud assembly (B).
6. Disconnect the 4P connector (A) and BLK wire (B) from the alternator.
7. Remove the mount bolt (A) and alternator bracket mounting bolt (B), then remove the harness clamp (C) from the alternator bracket.
8. Install in the reverse order of removal.
9. Enter the anti-theft code for the radio, then enter the customer's radio station presets.
Let me know what you find or if you have other questions.
Images (Click to enlarge)
Wednesday, September 30th, 2020 AT 3:48 PM