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Is it the original 24 volt system where it is 12V negative ground from one battery and 12V positive ground from the other battery and is isolated from the chassis? The generator, voltage regulator and starter are all 24 volt and are a totally isolated system, 12 volt is drawn off for everything else. Or has it been changed over to 24 volt by putting the 2 12 volt batteries in series. Many were changed to a true 12 volt system using the 2 12 volt batteries. John Deere even sells this conversion....James
 

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Discussion Starter · #3 ·
Right now it has a cable going from the side of the starter to the positive on the far side battery. The negative from that battery comes over to the near side battery positive and the negative from the near battery goes to the solenoid on the starter.

I have had the generator, regulator and starter all replaced in the last 10 years. Maybe one of the guys doing the work switched the wiring?
 

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Are you using a photo hosting site like photobucket, piccasa, ect? I did some extensive work on a 4010D Wheatland that was 24V, but they fried the generator so I switched it to 12V. Your 24V system is negative ground, 2 12V batteries hooked in series. When I switched, we used a Motorola alternator and starter from a junk yard 4020, then adjusted the wiring according. 24V is only for starting, everything else was 12V.
 
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