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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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