1993 Johnson Evinrude "ET" 40 thru 55 Service Repair Manual, P/N 508283, Page 133Get this manual
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STEPRUNNING OUTPUT TEST
1 Twist and remove primary leads from ignition coilsr;Ql 2.atwist to install Stevens Instrument NoTS-77 terminal extenders, or equivalent, on Ignition cOIl pnmary postsr;