A TO-20 will not have a solenoid unless someone has added one to it. It has a switch that is on the bell housing. The hot battery cable runs to one side and a cable comes off the other side and runs to the starter. When you move the shifter to the S position the shifter linkage pushes up on the switch on the bell housing and completes the circuit. If someone has added a solenoid to it I would remove it and use the original starting system for two reasons. It"s a simpler system and there is less to trouble shoot if something goes wrong and it is safer. You can"t crank the tractor in gear with the original system. All the wiring diagrams you need can be found at FENA. Ferguson Enthusiasts of North America. It"s under the resources tab. http://fergusontractors.org/fena/
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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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