It's got to be something electrical that is submerged in the coolant, but isolated from the block, and something that is energized all the time.
Can't be something that would present a large surface area, that would kill the battery in no time. So something small, I keep thinking a temp sending unit wired up strangely, normally that would not be energized with the key off.
There isn't an electrical lug on the alternator touching anything on the temp sending unit is there?
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