Technical Service Manual Download for Rams
If you own a Ram 2002+, you can download a PDF version of the Technical Service Manual
They don't have 2002, but 2003 should be the same (unless you have a 5.9L).
I use the heck out of my copy. It has wiring diagrams, trouble-shooting procedures, and all the OBD codes for the Rams.
It has been useful for MANY mods that some of us have done. For instance, by studying this manual, several of us have determined that if you have either the premium sound system, keyless entry, or the overhead computer, you can easily add steering wheel radio controls for ANY version of Dodge's stereos. I modded mine for less than $50.
These manuals don't have a part number list (darn), but they are very useful.
Just trying to help as much as I can.
They don't have 2002, but 2003 should be the same (unless you have a 5.9L).
I use the heck out of my copy. It has wiring diagrams, trouble-shooting procedures, and all the OBD codes for the Rams.
It has been useful for MANY mods that some of us have done. For instance, by studying this manual, several of us have determined that if you have either the premium sound system, keyless entry, or the overhead computer, you can easily add steering wheel radio controls for ANY version of Dodge's stereos. I modded mine for less than $50.

These manuals don't have a part number list (darn), but they are very useful.
Just trying to help as much as I can.


