2003 Johnson ST 55 HP WRL 2 Stroke Commercial Service Manual, PN 5005483, Page 82Get this manual
IGNITION SYSTEM TESTS near zeroReplace spark plug lead if your test results varyA steady spark, in the tester at or before maximum specified amperage, indicates good coilRefer to Ignition Coil Specifications
Surface Leakage Test IMPORTANT: When conducting these tests to the coil, do not exceed its maximum specified amperageThe ignition coil and spark plug lead should 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 coilspark plug lead, and spark plug cover