Looking at the wiring diagram, that will be a four-terminal solenoid - two large terminals and two small. Ensure that you're in Park or Neutral with the parking brake applied, switch the ignition on and use a heavy cable to bridge the two large terminals - the engine should crank and run. If it does, then you probably just need a new solenoid. The cable which you use to bridge the solenoid should be of similar diameter to the two heavy cables which attach to those large terminals - if you have a set of jump leads then one of those would do the job.
If it still doesn't crank then the problem would likely be with the connections to the starter-mounted solenoid, or the starter/solenoid assembly itself. You can remove and clean the connectors, and then after that you'd need to have the starter assembly tested if it still failed to crank.