Remove spark plugs. Rig a spark tester whereas you can set a .040 gap. Disconnect the large RED electrical plug at the engine. Crank the engine bu using a small jumper from the battery terminal of the starter solenoid to the 3/8" nut on the solenoid (not the 3/8" ground nut).<br /><br />If you now have spark, replace the ignition switch as it is in all probability shorting out.<br /><br />Note that the engine must be cranking over at least 300 rpm in order to initialize the ignition system. Any less rpm results in either erratic or no ignition (spark).
