1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 179Get this manual
Charge Coil Tests 1Short test: Disconnect two-wire connector between charge coils and power pack and plug both ends into adapterTurn all adapter switches "Off Set meter switches to Negative (-) and 500 Clip black meter lead to timer base, place red meter lead in pinhole "A Crank engine and observe meterMove red meter lead to pinhole "B" and crank engineAny reading on either test means charge coil is shortedRepair or replace2Output testWith red meter lead in pinhole "B" place black meter lead in pinhole "A Crank engine and observe meterIf meter indicates 160 volts or higher charge coil is OKIf there is no meter reading, replace stator
Sensor Coil Tests 1Short testReconnect two-wire connectorDisconnect fourwire connector, and connect to adapterSet meter switches to and 5Clip black meter lead to timer base and place red meter lead in pinhole" All adapter switches "Off Crank engine and observe meterMove red meter lead to pinhole "B Crank engineMove meter red lead to pinhole "C Crank engineObserve meterAny reading on either test means sensor coil is shortedRepair or replace 2Output test: Place red meter lead in pinhole "B," place black meter lead in pinhole "A Crank engine and observe meterRemove red lead from pinhole "B" and place into pinhole "C Crank engine and observe meterA meter reading of 0.3 volt or more means sensor coils are OKIf meter reads less than 0.3 volt replace sensor coil