TX Jim the battery A and B wire was what I was telling him to hook together. They go to the circuit breakers under the dash but they power everything on the tractor not just the lights. The power goes to the two power terminals on the key switch.I am not explaining this very well.
As for your other posting you have too modify the wiring harness. There is not a kit I know of to just plug it in and go. There are several serial number breaks on the wiring harnesses on the JD 4020. I think that there are four different diesel harnesses.
It is not hard to change the harness but you need to under stand what you are doing. It is not a job for someone that is not familiar with the how they are wired. The original 24 volt system was kind of an oddity in itself. I never like the way it worked. Everything had to be perfect or the batteries would not stay balanced.
I remember having to wire in a light bulb on the positive ground system when you put a negative grounded radio on the tractor. If you did not the one set of batteries, in a long day, would discharge.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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