720 electrical system, positive or negative ground?
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Thread: 720 electrical system, positive or negative ground?

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    720 electrical system, positive or negative ground?

    I have a 1958 720 diesel pony motor tractor, and need to know if this John Deere is positive, or negative ground. Can someone tell me? I have talked to 5 dealers, and have received 5 answers, which is strange, as there is only one answer--it is either positive ground, or negative ground.Help please.

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    Quote Originally Posted by Horsethief View Post
    I have a 1958 720 diesel pony motor tractor, and need to know if this John Deere is positive, or negative ground. Can someone tell me? I have talked to 5 dealers, and have received 5 answers, which is strange, as there is only one answer--it is either positive ground, or negative ground.Help please.
    I believe this question was brought up previously. Over the years the tractor has probably been worked on by several people.
    Are you asking if it is supposed to be Positive or Negative Ground or what is is currently?
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    John Deere720 diesel positive or negative groud.

    The tractor has not run for 20 years. I installed a 6 volt battery, ground to positive side of battery. I got a discharge on the ammeter. The starter for the pony motor does not operate however, and believe I have a wiring problem. Some of the wires are in bad condition. I hope I am write, in using a positive ground on this tractor.

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    TractorData is showing positive ground for a 12V system (2 x 6V batteries).
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    Quote Originally Posted by jgayman View Post
    TractorData is showing positive ground for a 12V system (2 x 6V batteries).
    Are you sure that's not for a 720 gas? I don't know about the pony electrical ground, but if I recall, it only uses one six volt battery.
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    All JD tractors with a generator came with battery attached positive ground from the factory with the exception of the 24 volt electrical systems which had no actual ground on generator/regulator. HTH's,Jim
    Last edited by Tx Jim; 01-11-2017 at 12:31 PM.

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    Quote Originally Posted by Tx Jim View Post
    All JD tractors with a generator came with battery attached positive ground from the factory with the exception of the 24 volt electrical systems which had no actual ground on generator/regulator. HTH's,Jim
    That sounds like an answer from Mr. Thinker in Green Magazine.
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    Don

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    Pony is positive ground. 6V. One battery.


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    Horsethief Positive or negative ground

    John Deere Service Manual SM2020, page 40-20-1 reads: ......connect a battery to it--positive post to a good ground on the engine and the negative post to the cranking motor switch terminal. This answers the question for the 720 Diesel tractor, pony motor. This is a positive ground system.
    BigJim55 likes this.

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