1997 Johnson Evinrude "EU" 90 thru 115 90 CV Service Manual, P/N 507267, Page 99Get this manual
Power Test INotel Do not exceed the coil's maximum specified amperage
when testing it
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 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
I Note Do not exceed the coil's maximum specified amperage
when testing itThe 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