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No doubt, you have lost a connection. It's most likely a ground connection because the rear of the car gets the most abuse from rain, road grime, rocks, etc. Specifically, use a 12 volt trouble light to find the red or black power line. Ground wires are green. If you can't get 12 volts using the ground to a 12 volt source you've found your problem. Unless you're familiar with electrical systems you should be able to find a local car mechanic to help. If you DO know about electrical then replace the ground wire if it's not getting a good ground.
How do you know the battery is fine? Sure sounds like you have a weak battery- the symptoms are all the electrical bits work- except starting the car. All your electrical systems don't need much current, but your starter needs a lot. If your battery isn't fresh then your car won't start, but everything else will appear to work. You can test
the battery by looking at voltage across the terminals when you try to
start the car, if it's less than 12 volts your battery needs to be
replaced. If your battery is more than 5 years old it should be
replaced anyway. Good luck, let us know how it goes.
Your description does not rule out a bad battery. Make sure the cable connections are clean and connected correctly. Assuming this is all good check the voltage with a DC volt meter. A fully charged battery should test 12.85 Volts. If it is very near 12 or lower it is a week battery. With jumper cables or other means to get good voltage try and start it again. If is start you have a bad or week battery. If you get it to run check the voltage again while it is running. The meter should now read 13.5 -14.0 volts. If not above 13 volts it is not charging properly causing the battery to run down.....................
the power window has a motor in it which requires 12 volts to work. when you remove the battery there is no source of 12 volts unless you have the engine running and the alternator is putting out electricity. so the power window will just not work. your house lights don't work when you unplug them, same principle at work here.
I had a similar problem with a Ford F350 diesel truck where the truck when started would cycle off and on until it settled down then ran steady. Finally it hadn't power to anything. I found that there are two heavy 10 gauge wires that lead from the positive terminal of the battery, leading to a connector block, and the terminal was corroded so thin that if finally burnt off resulting in a dead truck. I would check out that same circuit in your Jeep, every car has one, it is a fusible link type or just leads to the main fuse block. There may also be another possibility, and that being a dead short that immediately drains the battery to zero. Check the battery voltage with a voltmeter, if it's at 12 volts, then look elsewhere. From your description though it looks like the first problem.
How have you determined that the alternator (generator) is working fine?
Whilst the engine is running you need to see if there is at least 12 volts (usually 13.5V) across the battery using a voltmeter or similar tool. Also, whilst the engine is running, what happens when you turn the headlights on? (Does the car stall or try to stall?) This would affect night driving using headlights.
Most importantly, you run the risk of damaging the diodes on the alternator whilst running the
engine with a flat or undercharged battery.
There is also a regulator that controls the voltage from the alternator.
have you checked all fuses, including engine fuses located under the bonnet?