Hi,
Have you checked all of the main fuses in the under-hood fuse box? Even if the fuses are good, confirm there is power to them. I attached a pic below showing the fuses. Check the main fuse that I circled.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Let me know what you find. If you lost power to everything but the headlamps, this main fuse may be the issue. Just be careful when testing it. It is a 100-amp fuse. Not that you can get shocked, but it could create other issues.
Let me know what you find.
Joe
See pic below.
Image (Click to make bigger)
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Thursday, February 9th, 2023 AT 1:18 PM