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It is most likely the alternator. You will need to check it and see if it needs replaced. All you need to do is hook up an electrical mulimeter while the car is running. Black wire to negative, red to positive and see how many volts you get. You should get between 13 and 15. Any lower and you need to check the alternator.
this sounds like a low battery problem ... the horn and lights do not take much energy to turn on, but starting the engine takes a lot of power. Try jumping the Jeep with another car, or a battery jump pack (available at any auto-parts store). If the engine kicks over and starts, then leave your Jeep running in park for about 15 minutes. After 15 minutes of running, turn the Jeep off and then try to start it again with no jump -- if it starts, you had a low battery, but the issue is probably solved (running the engine recharges the battery). If, after you have had the car running for 15 minutes and turn it off, it does not start on its own, you probably need a new battery (and you should have your electrical system checked as you might have a bad alternator that is not charging your battery). Sears Auto Canter has a great piece of equipment that can test your battery, and your entire electrical system (including the alternator) in just a few minutes. I recommend that you take your Jeep to a Sears Auto Center and have it checked, whether or not the jump worked because their system can make sure that there is not a slow drain on the battery (due to a loose connection or something like that) which would cause you to have the same problem again.
If you havent replaced the battery I would start there. If the battery has a dead cell in it then it will effectively remove the charge that your alternator is putting out causing your vehicle to stop running because it has no power. I would jump start the car without the battery hook up and remove the cables and see if it runs that way. If it does you have a bad battery.
Hi, there will be diodes in the generator that are letting the power from the battery drain away through the parked times when not in use. to prove it charge the battery- then disconnect the negative terminal on the battery, connect 24 hours later and see if the battery as kept it charge, if so - fit new alternator, good luck.
I would check the alternator again, it apparently isn't charging the battery with engine running. You need a volt meter or amp meter to test this. Also does the battery discharge when the car is not running?
What initiated the need for jump starting? Is the alternator charging? Has the battery been checked?
To check the alternator, once the engine has been jumped and is running, remove one of the battery post connections. If the engine dies, the alternator is not charging the battery, and the symptoms you describe are the on-board computer going through low voltage spasms until sufficient electrical power to operate the engine / tranny is drained and the car dies.
If the car continues to run with no battery attached, the alternator is charging - - - and I would recommend removing the battery and having it checked and (if good) recharged to full capacity. I would also recommend having it charged even if the alternator is the problem just to delay the onset of the low voltage problems. The car should operate normally for a few miles before the battery drains too low after a full recharge, enabling you to get it to a shop for alternator service / replacement.
If you attempt replacing the alternator yourself, make sure the battery is disconnected prior to starting the job. Saves blowing up good stuff by accidental short.