Hi Chris,
when you press the brakes or use the headlamps, the voltage will drop. I need to know how low it drops, so I need you to perform a test.
I want you to test the alternator's output to make sure we have a good one. New or not, it can be faulty.
Here is a link that explains how to test one. All you will need is a voltmeter or multimeter. Follow the directions in the link and let me know the results.
https://www.2carpros.com/articles/how-to-check-a-car-alternator
Also, make sure the battery terminals are both clean and tight, the battery cables are in good condition, and a quick inspection of grounds.
Let me know what you find.
Take care,
Joe
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Tuesday, March 21st, 2023 AT 7:58 PM