I just put on a new alternator,water pump
both pulley's ac compressor, replace my
intention pulley and all and my truck still
squealing last but not least a new belt
It is because of the belt tensioner. Replace the belt tensioner, because it starts to separate where the spring is, so it miss-aligns the belt, thus causing the noise. Just replacing the pulley on the tensioner is not going to help which I suspect you did.
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