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Hi, Here's another source of troubleshooting information: http://www.silveradosierra.com/electrical/2003-silverado-wont-crank-t18318.html
Cut and paste that into your web browser, if clicking on the link doesn't get you there. This gentleman located his problem by confirming the Start Relay in the Fuse Box under the hood was working (clicking, this confirms the PCM is good also) when he turned the ignition key to start his truck. He observed slight sparking and arcing between the Starter Solenoid and the Starter connections and determined them to be corroded and the source of the trouble, resulting in the intermittent starting conditions happening. Once again, Good Luck.
Below is a link to a web page that gives belt routing diagrams. Simply copy and paste it into your browser's address bar. One there choose the correct make, model and engine and a list of belts will show up. In that list click on the "Belt Routing Diagram link and several out of work Umpa Lumpas will appear with the diagram tools to install it. Ok would you believe just the diagram? :) Hope this helps.