* Faulty ignition switch: If the ignition switch is faulty, it may not be sending power to the starter solenoid, which prevents the engine from cranking. Try turning the key to the "On" position and listening for a clicking sound from the starter solenoid. If you don't hear a click, the ignition switch may be bad.
* Bad starter solenoid: If the starter solenoid is bad, it may not be engaging the starter motor, which prevents the engine from cranking. Try tapping the starter solenoid with a hammer while someone else turns the key to the "Start" position. If the engine cranks, the starter solenoid may be bad.
* Loose battery connections: If the battery connections are loose, it may not be providing enough power to the starter motor, which prevents the engine from cranking. Try tightening the battery connections and see if that resolves the issue.
* Faulty neutral safety switch: If the neutral safety switch is faulty, it may not be allowing the starter to engage when the transmission is in neutral or park. Try shifting the transmission into different gears and see if that makes the engine crank.
If you are not able to resolve the issue yourself, you may need to take your Jeep to a mechanic for further diagnosis and repair.