1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 263Get this manual
Key Switch Check, Ohmmeter
1Disconnect battery leads and leads at the key switch
2With key switch in "OFFpositionconnect continuity light or meter leads between key switch "BAn" and "A" terminalsLight or meter should not show continuity
3 Turn key switch to "ONpositionLight or meter should show continuity
[}]] 4Turn key switch to "START" position Light or meter should still show continuity