1980 Johnson 4HP Service Manual, Page 37Get this manual
test for shorts to ground, calibrate the ohmmeter to high ohm scale Connect the bIack meter lead (-) to the armature plate (g rou nd)Attach the red meter lead (+) to the terminal jumper wire in the connectorSee Figure 4-16 Observe meterSwitch red cavity lead from cavity to cavity Observe meterneedle movement indicates the sensor coil leads shorted to groundshorted sensor must replacedthe grounded lead repaired to remove the shorted condition CHARGE COIL TEST Insert jumper wire to terminal in the armature plate end of the connectorSee Figure 4-17 Insert jumper wire to terminal in the armature plate end of the connectorSee Figure 4-17 test the resistance, connect 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
1High ohm scale 2Black meter lead Red meter lead 4Jumper wire '
5Armature plate 6Terminal 7Terminal 1High ohm scale 2Black meter lead Armature plate 4Red meter lead 5Jumper wire 6Terminal 7Terminal