Why won't my jeep start after replacing the battery & the spark plugs?

SOURCE: 1988 Jeep Wrangler wont start.

Try your camshaft possition sensor. If it is the same as my problem I just had to replace that and it started right up. Oh and mine was built into the distributer assembly. Take off cap and pin it's the plastic thing at the bottom. Should just pop out and you have to go to the dealer to get the part. Hopefully this helps!

SOURCE: 2006 Jeep Wrangler won't start

First, make sure you can turn the engine by hand. If you can't then the starter can't turn it either. Have someone else turn the key and look for the source of the click...may be a relay. Go over the starting circuit with a volt meter. Check for power at the starter main terminal and then with the key turned to "start" check for power at the trigger terminal on the starter. Check battery voltage and check relay operation.
You have a neutral safety switch on the transmission if its an automatic and a clutch switch if it's a stick. Check them as well. Make sure battery grounding on fender and block are also clean and secure.

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SOURCE: jeep cherokee 2.5 diesel. wont start

sound like starter or starter solenoid bad.

SOURCE: 99 Jeep Cherokee Sport, 4.0L -won't start

you need to have it connected to an OBD2 machine and watch if you are missing the cam sensor showing RPMs
or if your missing crank sensors RPMs,
it could be a wiring problem or computer if your seeing the RPMs from both sensors,and the last thing i would check is hooking up a fuel gauge to the reed valve and watch what fuel pressure you have while cranking,if the cam sensor is the culprit it will turn the fuel off after the cranking.

SOURCE: 2001 Jeep Cherokee 4.0 Installed new

Hi. A single click from under the hood on an attempted start could mean a bad starter relay. You may want to test the battery also if there is a charge. Might be the car is not charging the battery.