1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 154Get this manual
Charge Coil Output 65 155 220 volts or higher 160 volts or higher
8If low or no reading, replace the charge coilSensor Coil Output Test (C.DVoltmeter Tester) 1Set meter switches to "5" and 5Separate fou r-wire connector between timer base and power packTo test for shorts, connect the black meter lead (-) to the timer base Attach the red meter lead (+) to the" A" terminal, then "B," then "C," then "D," while cranking the engineAny needle movement indicates the sensor coil or leads are shortedA shorted sensor must be replaced, or the shorted lead repaired to remove the shorted condition2To test sensor coil output, insert meter black lead probe into cavity "D" of four-wire connector from timer base3Insert meter red lead probe into cavity "A" of four-wire connector from timer base4 Crank engine and observe meter reading5Move meter red lead from cavity" A" to cavity liB" of the connector6Crank engine and observe meter reading7Move meter red lead from cavity "B" to cavity connector8Crank engine and observe meter reading3-23