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check the battery conections for tightness then check continuaty to starter motor.. if power is getting to starter , could be starter. however if any of the dash lights go dim when turning key , suspect the battery.
First, check starter terminals for power: large terminal should have 12v at all times (except ford type with remote solenoid) Small terminal should have 12v when key is turned to "start" If voltage readings are correct and battery terminals are clean, replace the starter. (clean means on the inside of the clamps, not that they look clean on the outside)If you have remote solenoid, testing is done at solenoid, following same procedure.
does it turn over? if it clicks and then stops really fast, it's your starter. don't worry, if it's the 4.0L it's an easy fix. 3 bolts and a hundred bucks and you'll be on your way. however, if all the interior electronics work, but when you turn the key nothing happens, you need to go through and clean all the electrical grounds and battery connecters. it happened to me (ironically my starter went out too) but that is the general problem. 1st gen grand cherokees are notorious for bad grounds.