Hi,
When you tested the battery, was the engine running when you found 13.4 volts? If that is the case, the alternator is working.
Do me a favor, before we start replacing things, I need to have you check the alternator output and see if it is producing. I'm not sure what battery voltage was that prompted it to be replaced. It can't produce 13.4v unless it's running.
Take a look through this link and let me know what you find:
https://www.2carpros.com/articles/how-to-check-a-car-alternator
Also, let me know what was happening when she indicated it was hard to start. For example, did it crank excessively prior to starting? Or did the starter not turn the engine fast enough?
Let me know,
Take care,
Joe
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Wednesday, April 19th, 2023 AT 6:01 PM