Welcome Rick, youre like the 4th "NEWCOMER" poster here who has asked 24 volt questions and the other three "gents" never got back with us or provided any feedback or were ever heard from again hmmmmmmm Who and where are those rascals lol Please let us know where youre from, how things turn out, any more questions, and again WELCOME.
Okay heres the deal. The innermost series tie point of the batteries (NOT the outer 24 volt + and - leads) is indeed connected to frame ground with that little jumper and there are TWO A & B voltage feeds up to the light switch, one 12 volt feed/battery is POS to frame Grounded, the other 12 volt feed/battery is NEG to frame Grounded, and those are for 12 volt loads like lights and gauges etc. NOW IF THAT JUMPER OR FUSE IS BLOWING OR BURNING its because ONE side (The A or B Feed) has a short or a too low resistance path to frame ground. Each A & B battery/feed is for 12 volt loads but if its lead is shorted to frame ground THATS A DEAD SHORT ACROSS ONE OF THE 12 VOLT BATTERIES therefore SHE BLOWSSSSSSSSSSSS
SO WHERES THE SHORT????? Okay, the 24 volt system/portion IS NOT POSITIVE GROUND as one person INCORRECTLY posted here, the 24 volt devices, starter and genny, are two wire devices that are electrically isolated from frame ground, they are FLOATING AND NOTTTTTTTTTTTTT POS OR NEG GROUNDED. Alllllllll other two cylinder Deeres 6 and 12 volt AREEEEEEEEE positive ground, the POS battery post is connected to frame ground BUT DONT CONNECT EITHER OF THE 24 VOLT LEADS TO FRAME GROUND they are for the 2 wire frame isolated devices ONLY.
Now, I used to be a used tractor dealer (also an Electrical Engineer) and also farmed with those old two cylinder 24 volt Deeres and did see shorts to frame ground develop in starters or gennys or in the mess of wires around that switch ITS A RATS NEST BEHIND THAT DASH. I know its not much help saying the shorts in the wiring harness or genny or starter BUT THATS THE BEST WE CAN DO NOT BEING THERE ARMED WITH A TESTER.
For one of the best articles that may help you understand, find or diagnose the problem, look back over on John Deere Forum a while back where a fine gentleman posted a link (and wil e mail it to you) to John Deere Service Bulletin (was it 268???) that explains the 24 volt system in detail. Or look on Duane Larson web site 2cylinderservice for that 24 volt system service Bulletin
Sorry we cnat help more, that system is hard to troubleshoot even if there armed with a tester let alone blind over the net GOTTA BE A SHORT
Again welcome, let us know more about yourself, give us some feedback, and give the JD Service Bulletin a look see BUT DONT POS OR NEG FRAME GROUND ANY OF THAT 24 VOLTS OUCHHHHHHHHHH
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