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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I�m handing him tools and he says, "give me that..." and I�ve already got it in his hand or "hand me that....."and I�ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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