1979 Evinrude 4 HP Outboards Service Manual, PN 5424, Page 36Get this manual
eTo test for shorts to groundcalibrate the ohmmeter to high ohm scale Connect the black meter lead (-) to the armature plate (ground) Attach the red meter lead (+) to the "Cterminal jumper wire in the connectorSee Figure 4-16Observe meterSwitch red cavity lead from cavityC" to cavityObserve meterAny needle movement indicates the sensor coil or leads are shorted to ground shorted sensor must be replacedor the grounded lead repaired to remove the shorted condition bInsert jumper wire to terminal "0" in the armature plate end of the connectorSee Figure 4- 17cTo test the resistance, connect an ohmmeter (calibrated to high ohm scale) between the two jumper wiresThe charge coil resistance is good if the needle indicates 575 75 ohmsSee Figure 4-17 dTo test for shorts to ground, calibrate the ohmmeter to high ohm scaleConnect the black meter lead (-) to the armature plate (ground) Attach the red meter lead (+) to the "A" terminal jumper wire in the connectorSee Figure 4-18Observe meterSwitch red meter lead from cavity "A" to cavity "C Observe meterAny needle movement indicates the charge coil must be replaced, or the grounded lead repaired to remove the shorted condition eDo not remove the jumper wires from the connector, and continue the troubleshooting procedure