1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 120Get this manual
STEPSTOP CIRCUIT TEST Elimination Test f31 1Remove the wire retainer and disconnect stop circuit 1-pin Amphenol connectorTo avoid possible shock hazard, do not handle ignition coils or spark tester during cranking tests2Crank engine and observe results at spark tester If spark now jumps alternately at each gap, the problem is in the stop circuitGo to Ohmmeter TestStop Button or Ohmmeter TestKey Switch If there is no spark at one or both gaps, go to STEP IGNITION PLATE OUTPUT TEST