Spider-Man, I'm pretty much in Bobs camp on this one. When I farmed with those 24 volt tractors and was a used tractor dealer I more then once (like other gents here) discovered a starter motor all filled with copper brush particles caused a battery discharge. Where the two batteries series tie in the middle there's a jumper connected to frame/ground whereby one battery is effectively POS grounded and the other NEG grounded (that's how they were designed and built as John Deere Service Bulletins and wiring diagrams indicate which I found to be correct) and excessive copper dust in the starter motor can provide a fault current path to frame/ground thereby draining the battery. You may be able to remove the starter motor and clean it which (if that's indeed the cause of your battery drain) might possibly cure it??? Is it BOTH or just one battery that's discharging??? There could be a ton of other causes mind you, but for now based on such limited information and not being there this is ONLY one possibility.
Like Bob well noted that system is NOT for rookies or anyone electrically challenged. I (an Electrical Engineer) owned and maintained them with no problem, but many farmer Billy Bobs are out to lunch and for them a 12 volt conversion (like the other gents posted) may be the better option.
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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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