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Originally Posted by ree
Nope. I've had one more mysterious dead battery since May, but that's it. It's so spurious that I've just decided that I'll live with the deep cycle battery + jumper.
If it's happening regularly for you, take it in. If it's no longer under warranty, you're concerned about the cost of diagnosing it, and you have some educated guess about what system might be the culprit, it might be worth investing in an ammeter. Wire it into your + terminal hookups and note the discharge rates at periodic intervals times while the vehicle is off. I'll look in my manuals for in-spec current's to expect (no promises I'll find the numbers). Then if you seem something larger than those, start pulling fuses in the systems you think might be to blame until the current measured by the ammeter drops to expected levels.
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Don't know if this helps, but the last time my battery died completely, I had noticed some of the instrument lights were on - The odometer reading, and a couple of panel lights to the rear seat heater and radio controls. That was it. We were camping, and had the interior lights set to 'off' with the rear hatch open for quite some time. When I went to close the hatch is when I noticed those lights. I figured they would turn off by themselves...but in the morning, the vehicle was completely dead.