1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 156Get this manual
1 2ol STEPRUNNING OUTPUT TEST
1Twist and remove all primary leads from ignition coils1 201 2Twisting in clockwise direction, install terminal extenders Stevens Instrument NoTS-77 or equivalent, to ignition coil primary posts1 201 3Install primary leads on terminal extenders
INotel Route all tester leads so they do not interfere with moving engine parts4Set peak-reading voltmeter to "POS" and "500 1201 5Connect PRV meter red lead to No.1 terminal extenderConnect meter black lead to clean engine ground6Start engine and run under load at RPM where ignition problem exists Meter must show 130 volts or higher7Repeat Steps and for remaining cylinders If one or more cylinders show low output, go to STEPCHARGE COIL TEST If one or more cylinders show no output, go to STEPSENSOR COIL TEST8Remove TS-77 extenders and install ignition coil primary leadsObserve proper wire routingReferto Page 3-18