1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 109Get this manual
Power Test
o hen testmg he COl'1
Do not exceed the coil's maximum specified amperage
Connect 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
f4l The ignition coil is tested with "normal" polarity connections
A steady spark in the tester at or before maximum specified amperage indicates good coilRefer to Ignition Coil Spe'tificationsSurface Leakage Test Do not exceed the coil's maximum specified amperage when testing the coilThe ignition coil and spark plug lead should be tested for leakage or insulation failures using the ignition testerLeakage is caused by moisture, cracks or holes in the coil housing or spark plug leads