2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Manual, Page 126Get this manual
IGNITION IGNITION SYSTEM TESTS
Power Pack Running Output
Twist and remove primary leads from ignition coilsUse clockwise twist to install Stevens Number TS-77 terminal extenders, or equivalent, to ignition coil primary postsInstall primary leads on terminal extendersObserve proper wire routingOrangeblue primary lead must be connected to number ignition coil
Ignition Coil Tests
To avoid personal injury from electrical shock, perform all coil tests on wooden (or insulated) bench top
Ignition Coil Specifications
Magneto C.DCoil Specifications Primary Resistance Secondary Resistance
0.1 0.05 275 50 Q
IMPORTANT: Route all tester leads so they do not interfere with moving engine partsConnect peak-reading voltmeter red lead to number terminal extenderConnect meter black lead to clean engine ground
Resistance Test
Resistance tests may be performed while the ignition coil is still mounted on the powerhead