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How did you check for the draw? Did you make sure the doors were closed? What year and model truck in this?
Can you clarify what you mean by you disconnected all electronics to the battery?
Okay I just want to clarify that. So this point the only thing connected to the battery is the positive negative battery cable and the fusible link wire that powers up the electrical systems in the fuse block. What year is your truck? Have you tried to remove each fuse until the draw goes away to isolate which circuit is causing the draw?