2003 Johnson ST 55 HP WRL 2 Stroke Commercial Service Manual, PN 5005483, Page 77Get this manual
IGNITION SYSTEM TESTS
SYSTEM TESTS
The following series of tests will systematically isolate problem area in the ignition systemTo reduce your troubleshooting time and to avoid incomplete results, perform these steps in the order written
To prevent possible arcing of high voltage, route tester leads at least in(51 mm) from any metal surfaceCrank the engineSpark should jump each tester gap alternately If tester shows good output on both cylinders, go to Running Output Test If tester shows good output on one cylinder, go to Cranking Output Test If tester shows no output, go to Stop Circuit Tests
IMPORTANT: All cranking output tests must be
performed with spark plugs installed and torqued in the cylinder headIf necessary to remove the spark plugs, be sure to keep the spark tester away from open spark plug holes
Total Output Test
Running Output Test
Twist and remove primary leads from ignition coilsUse clockwise twist to install Stevens NoTS-77 terminal extenders, or equivalent, on ignition coil primary postsInstall primary leads on terminal extendersObserve proper wire routingOrangeblue primary lead must be connected to the Number ignition coil&