how to replace tension pully cause belt keeps slipping offan belt is new on 1999 Dodge Ram 1500

an belt is to lose what should i do

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1 answer
The first thing I would check is this https://docs.google.com/file/d/1NllTaU3S4Ci9rcfDnlhdjNp8O4CgJCitDUyCBa7A47Ji1YNpq-cwM35OYmAS2qbcyQmWSvE_F7TRi7kf/edit?usp=sharing