Hello. Welcome to FixYa. Please allow us to assist you.
We are sorry that you are experiencing issues with your Camry.
Personally, I am inclined to believe that your replacement alternator is not designed to provide sufficient amperage output with your electrical draw/usage. You probably have a 60-amp output alternator now installed. More often than not, the lower amperage alternator will not develop overcome a constant draw, like headlights, rear defroster, etc.
The dim and the return is the voltage regulator increasing the voltage.
What you can do:
I would recommend exchanging your current alternator with a 90 amp output alternator to cure this issue.
Thanks for choosing FixYa for assistance today.
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