Here is a serpentine belt diagram for a 2004 Dodge Ram 1500 SLT 4.7L truck. The legend for the labels is:
1) Generator Pulley
2) Accessory Drive Belt
3) Power Steering Pump Pulley
4) Crankshaft Pulley
5) Idler Pulley
6) Tensioner
7) A/C Compressor Pulley
8) Water Pump Pulley