Because you're crazy...
You need to see your doctor...
There's medication available that can help with your hallucinations...
OR ...
If they are actually are flickering... (you'll need witnesses for clarification)
You could do the "Big Three" and improve all your ground points.
The alternator is controlled by the ECU ...
Check and clean the connector on your alternator to help make sure your ECU can speak clearly to it...
You want a solid clean connection between the two.
The LG/W wire is the control wire coming from the ECU...
It adjusts the alternator's output voltage and current.
Make sure is is a clean/solid connection.