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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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