Well bummer....went to start the LR3 yesterday and it was totally dead. As in not even the door locks would operate. This is a first - I have in the past been able to leave her sit for a week or more with no issues. I've also been able to leave her sit with the fridge running in the summer and still start it the next day with no problems.
I charged it fully with my nifty super-deluxe-wonder charger after first using my old charger to raise the voltage from the 4v I saw on the my meter. (note- super-deluxe-wonder chargers are all well and good but won't start charging a dead battery until you get the voltage up over 6v, so don't toss that good old-fashion 'dumb' charger just yet) The charger went through it's routine over a couple hours and brought me back to 'full'. I then left it overnight and again this morning had the same thing - about 4v at the battery and totally dead.
At this point the battery is up for replacement. Regardless of the cause of the problem automotive batteries don't like being drawn down that far and it's certainly compromised, and I don't know how old it is anyway.
The real question is what's pulling it dead. The obvious suspects are the circuits I've added to run lights, fridge, radio, etc, but testing each of the shows no draw on my ammeter with thing off. I did a quick check of the draw on the main power lead and found about 5 amps and changing, but I think that was because I had just turned the truck off and the computers were still going through their 'shut down' routine, plus I was still charging the battery.
The next step will be to get the battery fully charged, then install a temporary jumper between the battery and the power wire. I'll put the meter in parallel with this, then disconnect the jumper and watch the draw. It should drop to only a few milliamps over about 20 minutes as the systems shut down, at least from what I've read.
I'd like to think I just had a battery suddenly expire, but it's never that simple.