The jeep has power and starter been replace but the jeep still wont start?

Most likely is intermittent in starter solenoid relay

Next most likely is key switch start connection intermittent. a tester will have to be used to find where the power is being lost from the start terminal of ignition switch to starter solenoid pilot connection to the main starter output power from solenoid to starter main contactor.

Read this post about a lot of electrical problems. It will give you an idea on what to look for.
https://www.cnet.com/forums/discussions/the-famous-jeep-grand-cherokee-electrical-problem-272172/5/
When it does not crank, check to see if voltage is getting to the starter. If it is, hit the starter. If it starts , replace it.

have you checked up on the steering column, those switches go bad and are easily replaced. I've had to do a few of those lately that had the same problem.

When you say it doesnt start what do you mean? does the engine crank over but wont start, or is it that when you turn the key nothing happens,i will assume it does nothing when the key is turned just due to the fact you replaced the battery,the next step is to check for power at the starter,have someone turn the key to start and hold it there while you check for power at the small connection at the starter, the starter has two connections, one has power at all times and the other a small connection gets power when the key is in the crank (start) position, if theres power at the starter then you have a bad starter, if theres no power then you may have a bad key chip or a bad neutral safty swith, now if the truck is spinning over but not starting then the first common thing i would check is for fuel preasure at the injector rail, good luck hope this helps.

The starter is most likely the problem,tap on the starter lightly with a hammer while trying to start the engine,dont get run over doing this it will take two people,if the engine starts,the starter needs replacing.

check power at starter termial if has power replace starter if not check alarm

Every morning at lunch time and evening my jeep won't start. It doesn't grind but the electrical goes crazy. After a couple of trys it finally starts. Help

Check the neutral position switch. this may need to be replaced or adjusted.

Have you tried to jump power directly on the starter? make the BIG power cable touch the small one on the starter with it still in the engine.(power touching the starter solenoid) use a LONG screwdriver to make them touch. you will not get shocked just make sure you only touch those 2. it will spark a bit but just hold it on there. if your starter clicks and does nothing then you have a bad starter. if it works then you have other problems.If it starts to smoke stop and make sure your engine is not frozen by turning the crankshaft with a large ratchet.

make sure voltage flows WHEN cranking also. check voltage at the starter while cranking. make sure it maintains 12 volts. or very close to it. nothing below 10.8 volts. check for corrosion on battey cables if voltage drops below that. that shows you have a curremt problem. also check grounds. or make new ones you know are good.

Good luck

Michael
ASE certified
plz rate

The starter is a good possibility. Try tapping the starter with a small hammer while trying to start it. Sometimes the brushes in the starter get dirty and tapping it will jar them loose. If the jeep starts then replace the starter. If the jeep does not start, take a test light and see if you are getting voltage to the big nut on the starter while trying to start it. If it's getting 12 volts and the jeep does not start, then replace the starter.