1978 Johnson 55 HP Outboards Service Manual, Page 44Get this manual
CHARGE COIL TEST (OHMMETER) aInsert jumper wire to terminal "A" in the armature plate end of the connectorSee Figure 4-19bInsert jumper wire to terminal "0" in the armature plate end of the connectorSee Figure 4-19cTo test the resistance, com1ect an ohmmeter (calibrated to high ohm scale) between the two jumper wiresThe charge coil resistance should be 475 75 ohmsSee Figure 4-19 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 4-20Any needle movement indicates the charge coil or leads are shorted to groundIf charge coil is shorted, stator must be replaced, or the grounded lead repaired to remove the shorted conditioneDo not remove the jumper wires from the connector, and continue the troubleshooting procedure3