Disconnect the wire that is connected to the ignition module. Small Engine Spark Plug. 15 Small Engine Starter Generator Wiring Diagram Engine Diagram Wiringg Net Small Engine Push Mower Mower Hi I have a Kohler CH680 Command Pro in Toro 648 Aerator. Kohler engine troubleshooting no spark . Unhook batt power first from points before hooking ohmmeter. In order for this process to work all of the major components. Insert the positive lead on the ohm meter into the end socket or the metal hoop on the spark plug wire. I attached a picture of its specs. Put your ohmmeter across the points when the cam retracts them. The ignition coil is needed to step up the voltage for the spark plug. This video demonstrates how to test both an ignition coil and a spark plug on a small engine. Use ohmmeter function you should get continuity or if there is contact resistance a resistance reading will appear. Small engine wont start. Tried to start today with no luck. The ignit...