First of all how old is your battery? Second if you can check the liquid levels in the cells. Third check to see if your alternator is charging, the idiot light may not be working!
Other than that here are a few things to look for, look at the cigarette lighter make sure it's not stuck in (on), glove box light may be on if applicable, rear window defroster relay may be stuck on, inside trunk light, any of the inside dome lights. These are few of the things that I have heard that has happened thru my 30 years of being a mechanic.
Disconnect both of your battery cables and then hook a small batter charger to the cables and use the charger as your power source, turn the charger on and see how many amps is being drawn. Knowing how many amps is being drawn can help determine what is on.
Relays can become stuck and pulling the fuse that feeds them will have no effect on the current drawn since the relay is already tripped and stuck to the on position.
Hope this helps and if you find out what the problem is let us know what you find.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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