I will bet that you have the wiring wrong on the back of the key switch and light switch. It is easy to do if you have them both off at the same time because they both use wires that are the same color but are supposed to be separated.
Get a factory JD service manual an get the correct wiring diagram for your model and serial number. There are four different possible wiring setups on a JD 3020. If you used a an IT service manual the one they have in the book is for the later serial numbers only. I get one or two each year messed up because of using IT service manuals.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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