1990 honda civic electric issue?

lemonface231972

New member
Whenever i drive at night my headlights will go dim then bright randomly. Also my sound system turns off randomly. usually starts happening when i am driving but also happens when im idle, but not as much. I've replaced the alternator and disconnected the sound system and still the same thing. Another thing is the charging light (indicator) comes on and then off randomly. can someone help I need to listen to my music without interruption. thanks
shouldn't be the battery cause i bought a new one when i replaced the alternator.
 
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