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This test is for the P series Onan engines. P216, P218 & P220 etc. with electronic ignition. First thing to do is confirm you are getting Battery voltage to the coil.
Connect a jumper lead directly from the positive battery terminal to the positive (+) coil terminal (smaller diameter of the two threaded posts). Crank engine over while watching for spark. If spark occurs, the problem is in the low oil pressure cut out switch (if equipped) or related wiring, the lubricating system (low oil pressure), or in the other circuitry bringing voltage to the coil. If no spark occurs it's time to test the ignition module.
Connect positive side of voltmeter to negative (-) coil terminal (larger diameter of the two threaded posts) and negative side of voltmeter to engine ground. Leave the jumper from the + battery terminal to the + coil terminal connected and rotate flywheel slowly by hand while observing voltmeter. Voltage should switch between battery voltage and 1-1.5 volts for each revolution. If voltage does not switch properly, replace ignition module.
Module is behind the flywheel mounted to the gearcase cover.
TJ
Connect a jumper lead directly from the positive battery terminal to the positive (+) coil terminal (smaller diameter of the two threaded posts). Crank engine over while watching for spark. If spark occurs, the problem is in the low oil pressure cut out switch (if equipped) or related wiring, the lubricating system (low oil pressure), or in the other circuitry bringing voltage to the coil. If no spark occurs it's time to test the ignition module.
Connect positive side of voltmeter to negative (-) coil terminal (larger diameter of the two threaded posts) and negative side of voltmeter to engine ground. Leave the jumper from the + battery terminal to the + coil terminal connected and rotate flywheel slowly by hand while observing voltmeter. Voltage should switch between battery voltage and 1-1.5 volts for each revolution. If voltage does not switch properly, replace ignition module.
Module is behind the flywheel mounted to the gearcase cover.
TJ
