We are working on a Kohler Magnum 18 HP engine in a JD garden tractor. We have put in a new ignition module, disconnected all switches and wiring. Our understanding to get a spark nothing needs to be hooked up except the starter, and it should develop a spark. The gap is set a 14 as required by the manual the magnets on the flywheel are in good condition. Seems like it should spark but doesn't, any suggestions to help us out?