2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Manual, PN 5005466, Page 82Get this manual
IGNITION IGNITION TESTS3.5 Hold the meter red lead against metal part of the coil extenderDo not hold metal part of meter lead when engine is operatingObserve meter readingStop the engineIf meter reads less than 220 volts, remove the ignition coil primary leadConnect ignition coil primary lead to Stevens NoPL-88 load adapter red leadConnect adapter black lead to clean engine groundCrank engine and observe meter
Results: Meter should indicate continuous reading of 220 volts or higherThe voltage reading must be steady at constant engine RPM