1978 Evinrude Outboards 9.9/15HP Service Manual, Page 38Get this manual
bInsert jumper wire to terminal "B" in the armature plate end of the connectorSee Figure 4-17cInsert jumper wire to terminal "C" in the armature plate end of the connectorSee Figure 4-17dTo test the resistance, connect an ohmmeter (calibrated on low ohm scale) between the two jumper wiresThe sensor coil resistance is good if the meter indicates 40 10 ohmsReplace the sensor coil if the resistance reading is not within this rangeSee Figure 4-17 eTo test for shorts to ground, ohmmeter to high ohm scale Connect the black meter lead (-) to the armature plate (ground)Attach the red meter lead (+) to the "c" terminal jumper wire in the connector, then to the "B" terminal$ee Figure 4-18Any needle movement indicates the sensor coil or leads ate shorted to groundA shorted sensor must be replaced, or the grounded lead repaired to remove the shorted condition
Jumper wires Low ohm scale Terminal "A" Terminal "B" Terminal "C" Terminal "D"
Jumper wires High ohm scale Terminal "A" Terminal "B" Terminal "c" Terminal "D"