2006 Johnson SD 3.5 HP 2 Stroke Outboard Service Manual, PN 5006562, Page 55Get this manual
IGNITION IGNITION TESTS IMPORTANT: To prevent high voltage arc, route tester leads at least in (51 mm) from any metal surfaceCrank the engineSpark should jump consistently If tester indicates good ignition, refer to Power Pack Running Output on p57 If there is no spark or poor spark, proceed to Stop Circuit Tests Ohmmeter Test IMPORTANT: All ohmmeter tests must be performed with the engine NOT running Calibrate an ohmmeter on appropriate scaleConnect meter leads between stop button lead terminal and clean engine ground The meter must show high reading
IMPORTANT: It is possible for the ignition system to have problem but still produce good outputIf the engine pops or backfires during starting, the ignition may be out of time Check flywheel condition and location
Stop Circuit Tests
Elimination Test
Disconnect black lead connector between stop button and power pack1Stop button lead