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4020 pic and a 24 volt wiring question

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This is the message I am getting when trying to post a pic Sorry, the board attachment quota has been reached.

The 24 volt 4020 - is it a positive ground system?
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J
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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