Hi,
When you checked the alternator voltage, did you have it loaded? Also, does the alternator light ever turn on while driving?
If the battery is fully charged, will it fail if it sits overnight without being run?
Let me know. Also, take a look through this link, you may find it of interest:
https://www.2carpros.com/articles/car-battery-dead-overnight
Also, when you installed the engine, did you keep the automatic transmission that came with your vehicle?
Let me know.
Take care,
Joe
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Friday, October 20th, 2023 AT 11:04 PM