Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi Don , my name is ***** ***** welcome to Just Answer . You can take a digital multimeter and set it to DC voltage , unhook the ground from the coil and hook the red lead to it , then take the black lead and ground it . Turn the key switch back and forth from off to run , you should see no voltage at all , even if there is the tiniest bit of voltage then the ignition switch is back feeding power to the ground on the coil .
Another thing that can cause this is overheating . Did you change spark plugs before this problem started ?