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 - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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