It sounds like the starter solenoid! I just replaced the Starter on my JEEP! Always a. GOOD IDEA to pull Battery - - Take to Auto Zone (any parts house) Have a Battery Capacity test done - VERIFY the Battery is OK! Are your Battery Connections - Clean and Tight! You can clean with Battery Cleaning Tool. After those two STEPS-- When The Jeep WON'T start -- Are you getting a 12V signal at your Starter Solenoid? (Check with DVM) If you are getting Voltage to the Solenoid - and the JEEP is NOT starting - YOU need another STARTER! Might be- WORN Brushes! A good REBUILT starter might run $ 75 - 80 bucks! Have to check on that one. GOOD LUCK! JB