The service manual's "wiring" chapter is full of errors and incomplete diagrams. Unfortunately, it is all we have to go on.

YOu have encounted a problem similar to Marie's car in Gainesville, Georgia. I worked on it some three years ago. The draw on her's was around 2 amps IIRC. I was in town for a weekend only and could not stick with the car for multiple visits - her options were to disconnect the battery or keep the car on the charger - she kept the car on a charger until she eventually sold it.

If you look in the diagrams, there are, as Dave pointed out, only a few places the 200 amp fuse feeds. In Maries' car, I took the underhood fuse box apart and found the "100 stud" (I think it's called) and found that of the four or five heavy red wires, ONE of them was the one with the current flowing. I simply ran out of time to track down where it went.

One thing I perhaps could have done, is wire a relay up to power that lead ONLY when the key was on. The fuse box itself had MANY fuses who power up only with the key, I could have wired a 30 amp or great relay up and got around the issue that way. I offer this as a suggestion to you, if you find that one of those heavy red wires is the problem.