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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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