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 - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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