Re: 05 grand Cherokee 5.7 will not start
If you donīt hear the faint click of the starter relay, then move the gear selector a few times out of Park or try to start in Neutral. Can be an adjustment thing, or a park/Neutral switch which is on its way out. Eventually the ignition switch itself can be the culprit.
If you hear the click of the starter relay, then you will have to check the ground connection of the starter solenoid. Corrosion or a loose connection can prevent it from starting.