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Q:

squealing belt at start up, quits, squeals again turning on headlights on 1991 Nissan 240SX

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I have cleaned the battery grounds and cables before, and the problem stopped. But that no longer fixes the problem
(1) Answer
Old /worn/contaminated/improperly adjusted belt? Sounds like a loose belt issue to me.