2003 Johnson ST 55 HP WRL 2 Stroke Commercial Service Manual, PN 5005483, Page 79Get this manual
IGNITION SYSTEM TESTS
Charge Coil Tests
Voltmeter Ground Test
5-pin Amphenol connectorSet peak-reading voltmeter to POS500Alternately connect voltmeter red lead to charge coil terminals "A" and "0" and black lead to clean engine groundCrank engine and observe meter at each connectionAny reading on either test indicates charge coil or leads are grounded Locate and repair ground, or replace charge coil If no reading is indicated, go to Voltmeter Output Test
If wiring and connector condition is good, go to Ohmmeter Continuity Test
DR4249A
Ohmmeter Continuity Test IMPORTANT: All ohmmeter tests must be performed with the engine NOT runningInsert ohmmeter leads between charge coil terminals "A" and "D