Motor cranks over but. Does not start,no fire

This is Kevin with NWA Auto Shop. Without seeing the vehicle, I can only theorize. Based on the limited information given, these are my thoughts. A) There is not enough information to answer this. I usually hook up my scan tool and look for a crank sensor signal when it comes to Dodge Rams. If there is no "Fire" or ignition you would need to know what is working before you can figure out what isn't. Kevin