I need a diagram show me how to replace the serpentine belt,I have the belt out. Model is a 2004 Dodge Ram 2500 Diesel cummins

Jeff, Check the attached links,instruction and guides, diagram for a serpentine belt, Good luck
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1997 3500 Wiring Diagram - Dodge Diesel - Diesel Truck Resource Forums

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Fig. Accessory serpentine belt routing-3.9L, 5.2L and 5.9L LDC gasoline engines IMAGE LINK




Fig. Accessory serpentine belt routing-5.9L HDC and 8.0L gasoline engines with A/C IMAGE LINK




Fig. Accessory serpentine belt routing-5.9L HDC and 8.0L gasoline engines without A/C IMAGE LINK

Hope this heps (remember to rating this answer).

Simplest water pump ever made. Simply remove the air filter housing from the engine. Should be 2 bolts that hold it on and a hose clamp on the intake hose. Then remove the serpentine belt from the water pump pulley. Achieve this by using a wrench to release tension off the tensioner pulley which is located below the water pump. Then there are 1 bolt on either side of the water pump shaft. then just simply pull it out. You may need to use a piece of wood and a hammer to tap it loose but it should come out easy. And install is the reverse. This engine has a O-ring instead of a gasket, put a little oil on the O-ring before installing. water pump install for 2004.5 325 HP 6 series Cummins. look on the driver side of valve covers to verify which model you have. 04 says 305HP 04.5 says 325HP

im assuming with a/c lol good luck

here ya go

Check this diagrams (click for zoom)...



Fig. Accessory serpentine belt routing-2004-05 5.9L Diesel engines with A/C





Fig. Accessory serpentine belt routing-2004-05 5.9L Diesel engines without A/C

Hope helps (remember rated this).

if you buy your belt at autozone the routing is on the package

Diagram should be under the hood in the area of the belt itself.