If you can take a picture and post it we can help you out, but I'm at a loss as to what you are talking about with the description.
Also be aware that you can see the complete parts catolog for a 4020 at jdparts.com
Click on the icon on the LH side of the page with the title "John Deere Parts Catolog" Type in your model number which is 4020 and then select the SN range that your tractor falls into. I'm guessing before 201,000 since its an LP, but you can check the SN if you are unsure. You can find any and all parts for that tractor in that catalog.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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