1998 Johnson Evinrude "EC" 2 thru 8 Service Manual, P/N 520202, Page 91Get this manual
Power Test
Do not exceed the coil's maximum specified amperage when testing it
rn The ignition coilredis lead to the primary terminal ofconnectested with "normal" polarity tionsConnect tester the coil
and the tester black lead to the ground tab Connect the high tension lead of the tester to the coil spark plug lead steady spark, in the tester at or before maximum specified amperage, indicates good coilRefer to Ignition Coil SpecificationsSurface Leakage Test
Do not exceed the coil's maximum specified amperage when testing it
The ignition coil and spark plug lead should be tested for leakage and insulation failures using the ignition testerLeakage is caused by moisture, cracks, or holes in the coil housing or spark plug leads[] With the tester's small black and red leads still connected, remove the tester's spark plug lead from the coilTurn on the tester and probe entire surface of the coil, spark plug lead, and spark plug coverFlashover will be apparent wherever insulation has broken downReplace any coil or spark plug lead that shows leakage