1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 160Get this manual
Charge Coil Tests
230 volts or higher 230 volts or higher
3No or low meter reading in above step, turn switches "A" and "B" on the adapter box "Off Crank the engine, if meter reads the voltage listed below (or higher) the charge coil is O.KCheck charge coil for shortsCharge Coil Tests
220 volts or higher 160 volts or higher
4Charge coil short testplace meter black lead to engine timer base assemblyPlace red meter lead alternately into pinhole "A" and "B Turn all switches on the adapter box to the "Off" positionCrank engine and observe meter Any indication on the meter other than zero, charge coil is shortedRepair or replace charge coi I
Sensor Coil Tests 1Turn all adapter switches "On 2Remove two-wire connector and reJoinSeparate four-wire connector between timer base and power packPlug into adapterSet meter switches to Sand volt scalesPlace black meter lead into pinhole "0 Place red meter lead into pinhole "A Start engine and run at minimum of 1000 rpmObserve meterMove red meter lead into pinholes "B," then "C The reading should be the voltage listed below (or higher) on all testsSensor Coil Tests