Here is what you need:
It's a SnapOn MT500 multimeter with shunt.
It's what you use to chase down parasitic draws. You disconnect one lead to the battery and place the shunt in series with the battery. Then the meter reads the voltage across the shunt and knows what the current draw is. In your case, when you shut the vehicle off, you see it draw something like 0.2 amps. Now it takes a minute of so for the system to shut off completely, but after that it should read "0.00" Yours will continue to read more than 0.00 so start unplugging things. You'll find out what's doing the drain. You should start with pulling fuses, then any power to radios door locks, a vanity mirror lamp, lamp in glove box, etc.
I've done this in the past, it works well.
You can find these used on eBay for $50 - $100. Just look for one with the shunt attachment (it was an option). A cheapo harbor freight tool wont read the amperage or allow you to run your jeep like this will - the cheap one cant handle the current.