1978 Johnson 4HP outboards Service Manual, Page 38Get this manual
SAFETY WARNING
The shock from this ignition system is severe and can do serious physical harmTo avoid possible shock hazards do not handle ignition coil or tester leads during this test
cCrank the engine and observe the results at the spark testerIf spark jumps at both gaps, the ignition system is OKCheck the spark plugs, and other engine systemsIf there is no spark, continue the troubleshooting procedure83024
1Four wire connector 2Three wire connector
Figure 4-14Cable Connectors
bInsert jumper wire to terminal "S" in the armature plate end of the connectorSee Figure 4-15cInsert jumper wire to terminal "C" in the armature plate end of the connectorSee Figure 4-15
Figure 4-13Spark Test
OHMMETER TESTS
Ohmmeter tests are necessary to determine if the sensor coil or charge coil have failed in manner which could cause ignition failure