1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 122Get this manual
STEPSTOP CIRCUIT TEST Elimination Test f31 1Remove component bracket cover and disconnect stop circuit 1-pin Amphenol connector
To avoid possible shock hazard, do not handle ignition coils or spark tester during cranking tests
2Crank 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