Hi, my 2013 LR4 was sitting in a covered (but cold) garage for about a month, and I came back today to find the battery dead. Called AAA to jump the battery and the AAA guy had trouble getting the car started. As soon as he disconnected his battery charger, the car would die. AAA guy said the alternator is likely dead, which makes sense to me as the battery was not being charged by the engine (and would not restart after turning the car off), but the alternator was also replaced about 8K miles ago so I'm not sure why it would need to be again. Side note: it was about 13 degrees when we tried to jump the car, and it was consistently pretty cold while the car was sitting. Could the issue be something other than a broken alternator?

 

Yes, the battery, BMS, grounding points are a few of the easy ones.
There are simple pinpoint tests from the workshop manual that should be followed if one wants to efficiently pinpoint the issue and correct it.
Tell us about the battery…

 

Thanks for the reply. I unfortunately don't have the equipment where I currently am to do too many diagnostics myself...
Regarding the battery, I last had it checked in November, and the resting voltage was 12.32V @ 781 CCA at that time which seemed fine. I'm debating getting it towed to my indy shop which is 60 miles away, or if there's anything I can try myself before I decide to do that. Any suggestions appreciated!

 

fyi, a battery with a resting voltage of 12.2 volts is typically rated a ~60% of capacity. That is not fine.
The “generator” in a Jag or LR will probably be successful in keeping the vehicle running provided the battery is of ”adequate” service. If the generator fails, the engine and systems should continue to run until the battery is depleted. As yours dies immediately, it can be the generator, battery or both.

Of course, any worthy generator should last 8 k miles, unless of course there was coolant dripping on it.
OEM alternator? or china special??

 

Thanks for the reply. Based on your comment and what I've read, I think I will start with a new battery and take this opportunity to upgrade to an H8.
The alternator was OEM, installed by JLR, and no coolant leaks. If the new battery still doesn't work, then I'll have to look at getting the alternator checked out.
Thanks again!

 

I have learned that any work completed at the dealer includes a 1 year warranty on parts and labour.

 

So I picked up a new Diehard H8 platinum and installed it last night. The car started right up with the new battery and everything works like new. I'll monitor everything for a few days to make sure the alternator is fine, but things are looking good. After I brought the old battery inside and let it sit for a few hours, I noticed it was ice-cold to the touch and heavy condensation forming on the surface. AAA claimed earlier it was putting out normal voltage, but I don't see how it could have been as it seems to have been frozen to the core. Lesson learned, don't trust AAA!

 

And… “its always the battery”.

If you put your vehicle details into your “signature” it becomes much easier to provide useful information like, did you choose the right battery for the vehicle…