Sounds to me like you have a draw on the system that is draining the battery when it sits.Hi All. I'm a member of the WrangerlForum, just found the TJ.
I have a new to me 2003. 4.0, automatic. 1 owner prior to myself. In Feb I began having start issues. Per auto zone's advice, replaced the alternator. Worked for a few days. Problem returned, took it to a mechanic that I've never used (out of town). He advised the the PCM was going bad. That was a headache. Bought one on ebay and had wrangerlfixllc repair/program. No issues, has been running like a champ. Two weeks ago, had a slow crank but start, and then no crank. Replaced the battery at that time. Started and drove fine for the weekend. Sat for a week, went to fire it up last night. Nothing. No click from starter. It did ding once or twice, and the gas/break/seatbelt/check gages lights flashed then nothing. (it is not low on gas and break is not on). The random lights are a bit of a concern. That was one of the first issues that pointed to pcm going out.
I have a volt meter coming via amazon tomorrow, going to start with checking the batter is charged. At this point its easier then me pulling it and taking it back to the shop I purchased it. Also going to try to jump it. Little confused that the new battery would be dead after only a week, so goes the relationship I have with the jeep thus far. Feels like a stray dog I'm trying to domesticate and every time I get close I get bit. It is my second jeep, and selling my first was the worst mistake I've ever made. I'm learning a lot from this one.
I haven't noticed the mentioned issues that would point to ignition switch pin. I can pull the key out while driving and it stays running. (thought I was going to die the first time they fell out.)
The connectors to the battery are clean and free of corrosion.
I do know there is a multifunction switch in the steering column that needs to be replaced. At this point the only symptom of that is the hazard lights occasionally coming on when I turn off my turn signal.
Thanks for any/all input.
Also, if anyone is in North West Louisiana/Arkansas, let me know, could use a few Jeep friends!
Maybe try throwing a battery tender on it to charge the battery then unplug it before you let it sit next time??
I assume it fires right up when jumped...