Its because your alternator is a 80 amp which is a lot of power drain ,some propriety belt sticky sprays will cure it for a while ,arrow chemicals used to make one 30 yrs ago in the Uk which was very good but aqs to sorting this one out then short of renewing the spring loaded tensioner their is not a lot you can other than to start engine and dont rev it let it idle for a minute and this will recharge the battery so stopping the strain on the belt and the screeching at the same time
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