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Time to bust out the multi meter and start tracing down where you do have power and where you don't. The OBD and cigarette lighter are on the same fuse, so start following the wiring back from there.
Have you ever found water in your fuse box? -_- I pulled mine today at work and there was like half a shot glass that came pouring out... I'm assuming this isn't normal
The fuse box in the cab, or the one under the hood? No I can't say that is normal. I know the one under the hood isn't sealed very well, but I've even sprayed under my hood multiple times washing it off and never got it wet yet.