2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 124Get this manual
IGNITION IGNITION SYSTEM TESTS
Resistance Tests
Resistance tests may be performed while the ignition coil is still mounted on the powerheadSTEP Twist and remove the spark plug leads and primary coil leads from the ignition coilConnect ohmmeter black lead to clean engine groundIf the coil is not mounted on the engine, connect meter black lead to ground tab on the coilConnect ohmmeter red lead to coil primary terminal Meter must show 0.1 0.05 ohms
STEP Test spark plug leads for continuityCalibrate ohmmeter on low ohms scaleAttach one ohmmeter lead to each spring terminalWhile wiggling both spark plug covers and entire length of the spark plug lead, the resistance should remain near zeroReplace spark plug lead if your test results varyDR4081