1996 Johnson/Evinrude Outboards 25, 35 3-Cylinder Service Manual, Page 104Get this manual
Tests Using Ignition Analyzer
When conducting coil tests using an ignition analyzer, do not exceed the coils' maximum specified amperage
Power Test
The ignition coil is tested with "normal" polarity connectionsConnect 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 the coil spark plug lead
A steady spark, in the tester at or before maximum specified amperage, indicates good coilRefer to Ignition Coil SpecificationsSurface Leakage Test 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 high tension lead from the coilTurn on the tester and probe entire surface of the coil, spark plug lead, and spark plug coverFlash over will be apparent wherever insulation has broken downReplace any coil or spark plug lead that shows leakage