Ford Tractor Ignition Switch Wiring Diagram | Free Wiring Ford Tractor Ignition Switch Wiring Diagram - Collections Of ford Tractor Ignition Switch Wiring Diagram Collection. ford Tractor Ignition Switch Wiring Diagram Collection. Wiring Diagram for Ignition Switch Lawn Mower Inspirationa ford. ford Ignition Coil Wiring Diagram Collection.Author: Ricardolevinsmorales How to Test a Ford 9N Ignition Coil | Sciencing Apr 24, 2017The ignition coil, located under the hood of the tractor, increases the voltage of the battery to a high enough level to start the 9N's engine. There are primary and secondary wire coils in the interior of the ignition coil housing . Each wire needs to be at a specific resistance to provide the voltage needed by the tractor.