1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 319Get this manual
Key Switch Check, Ohmmeter
1Disconnect battery leads and leads at the key switch
With key switch in "OFF" position, connect continuity light or meter leads between key switch "BATT" and "A" terminalsLight or meter should not show continuity key switch to "ON" positionLight or meter should show continuity
I3.I] 3Turn
4Turn key switch to "START" positionLight or meter
should still show continuity
11 Ell824005
5With key held in "START" position, transfer lead from "A" terminal to "S" terminalLight or meter should still show continuity
[]]] 6Transfer leads to "M" terminalsLight or meter should not show continuity in "START" or "ON" positions