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Roll the key ford to acc not started just forward so radio comes onand leave this way for 5 min til security light goes away turn off atempt to start. May die instantly. Just turn off again and restart. Works for my camaro. Or turn key to acc. Then back to off and repeat. This step usually 25 -50 times and it may resrt system. Youll hear a bit off clicking if it works.
It sounds like a bad starter solenoid/starter, because a starter sits so close to a engine and exhaust that over the years the heat starts breaking down the components and when you drive your Jeep the starter solenoid gets "heat soaked" so when you've been driving your Jeep around for awhile and then turn it off the solenoid is "heat soaked", it needs to cool off before it will engage the starter again. Sometimes it can take up to a few hours to work again. Some people hit the starter w(the engine off) with a hammer to try to free it up.
The solution is to replace the starter with a new one and your Jeep will start up every time. Most starters come with a new solenoid already attached so it's best to replace them both.
Hard to guess, but the best idea I can come up with is that the regulator in the alternator malfunctioned, and you were getting wide variations in voltage throughout the whole system.
Once reset, if it seems to be normal, I would not worry.
If you want to check, get a voltmeter and check alternator output.