Hi,
It sounds like we may have two different issues here. First, the noise could be related to a failing universal joint. That is what I would inspect first. Here is a link to help:
https://www.2carpros.com/articles/how-u-joints-work
Now, if the battery drops as you mentioned, chances are you have a short. It does sound like the alternator is doing its job.
Here is what I want you to try. Make sure the battery is fully charged. Connect it to cause the drop in voltage. Then, remove one fuse at a time in the under-hood fuse box to see if the voltage drop stops. If it does, let me know what fuse it is.
Try this and let me know the results.
Take care,
Joe
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Tuesday, August 30th, 2022 AT 8:41 PM