You need to check the battery drain. Disconnect the negative terminal of the battery and using a multimeter between the negative terminal of the battery and the now disconnected negative lead check the amperage which is being drawn from the battery. Your reading should settle anything between 0.03 and 0.20A but hopefully nearer the lower end. If it is above this then you will have to systematicly disconnect each electricrical item until you have a good reading. Once you have get a good reading on the multimeter you should be able have a good idea of what was causing the drain. Good luck
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I was having the same issue with my 95 GMC. I replaced the battery and alternator. It would start fine at times, at other times it would be sluggish. I finally took the starter off and had it checked. Turns out the starter was bad. When it would get hot, it would act as though the battery was dead. Replaced the starter and it has not acted up again. Have the starter checked. Replace if bad.
Perhaps the batter is "dead" dead and has met the end of it's functional life. You see, lead batteries like car batteries convert lead ions in solution into a solid as energy by chemical reaction. Charging the batter reverses the process, but the process becomes less and less reverseable as the age of the batter increases. When the process can no longer be efficiently reversed by "charging", the battery remains in it's dead, or semi-dead state, where it might run for only a few seconds.
Also, your alternator might be shot because technically, if you can start your engine, the alternator should provide the power to remain on; the battery serves only the purpose of starting the car and receiving the charge from the alternator to power the rest of the car's electronics.
Test both the battery and alternator, no more than $100-$150 to fix either problem.
Check for lights on (glovebox etc) put ammeter from either disconnected battery cable to the battery and check draw by pulling one fuse at a time 'till draw disappears or gets substantially lower. Then check items served by that fuse for any problems. Can't just be that it misses you when you are away? Had battery charged and load tested?
Its hard to say since you didn't include the year and model of your Jeep also when and how long it takes the battery to drain but Im going to assume that its probably a newer model Jeep like a 95 or so. In the main fusebox under the hood there is a charging system fuse in it that is a rather large fuse about an inch long or so and around 80 to 100 amps. Check to see if that fuse has blown. This fuse would casue the battery to drain becasue even if the alternator is charging, the connection from the alternator to the battery is pretty much broken so the car is running off of only the charge in the battery. It would cause symtoms similar to the alternator not charging. Its an easy fix and probably cost less that $5.
Pretty sure the regulator on those is in the computer (I know...really dumb...) There is a way to wire around it using an older style regulator but it will keep the check engine light on and may not pass inspection like that.
This happened to me once, but that guy that put my battery in crossed the wires and blew a bunch of fuses. I thought it was my alternator but it wasn't. I removed it and tested it, it was fine. Make sure you double check before buying expensive things. Anyways, it was just a fuse, I can't be sure which one it was exactly but I replaced 3 of them. Two #60 fuses (which I'm assuming were the problem because they were fuses for the alternator) and another one that I can't remember now. Anyways, if your having a problem like this replace all your fuses first, all of them together would only cost about 15 bucks. If the problem persist remove your alternator to test it because you'll get a more accurate reading this way. If its not your alternator or fuses, I don't know.