2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Manual, PN 5005471, Page 79Get this manual
IGNITION SYSTEM TESTS STEP Test spark plug leads for continuityCalibrate ohmmeter on low ohms scaleAttach one meter lead to each spring terminalWhile wiggling both spark plug covers and entire length of the spark plug lead, the resistance should remain near zeroReplace spark plug lead if your test results varyConnect tester red lead to the primary terminal of the coil and the tester black lead to the ground tabConnect the high tension lead of the tester to one of the coil's spark plug terminalsConnect jumper between the other spark plug terminal and the coil's ground tabDR4081
Primary terminal Ground tab Coil spark plug lead Ground second spark plug lead
Ignition Coil Analyzer Tests
IMPORTANT: Ignition coil must be removed
from the powerhead for analyzer testsWhen conducting these tests to the coil, do not exceed its maximum specified amperageCoil Tester Specifications
Operating Amps (Max) Analyzer Polarity
A steady spark in the tester, at or before maximum specified amperage, indicates good coilSurface Leakage Test The ignition coil and spark plug lead can be tested for leakage or insulation failures using the ignition analyzerLeakage is caused by moisture, cracks, or holes in the coil housing or spark plug leadsWith the analyzer's black and red leads still connected from the Power Test, remove the analyzer's high tension lead from the coilTurn on the analyzer and probe the entire surfaces of the coil, spark plug lead, and spark plug cover