The ignition switch is working good now. I stopped by the JD dealership in Tecumseh Michigan and they were able to help. There really is not a specific schmatic for the 520 only and the schematic I was using covered multiple tractors. He copied a 720 schematic and recommended I follow this schematic. Also he stated not to be concerned by the label of the switch or on the schmatic. Just follow the notes that describe each wire. Apparently I was misinterpenting the terminals location on the switch because I used the "ing" label for the top position of the switch. I needed to rotate the switch almost 90 degrees clockwise. Still the terminals didn't match the schematic but it works.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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