Hi. Here is a belt diagram for your truck.
Drive belts on diesel engines are equipped with a spring loaded automatic belt tensioner.This belt tensioner will be used on all belt configurations, such as with or without air conditioning.
INSTALLATION CAUTION: When installing the accessory drive belt, the belt must be routed correctly. If not, engine may overheat due to water pump rotating in wrong direction. Check for correct engine belt routing. The correct belt with correct length must be used.
You're welcome, good luck!