1980 Johnson 4HP Service Manual, Page 39Get this manual
SENSOR COIL TESTS Set meter switches toS" and 5First, check for shorts to ground Disconnect four wire connectorInsert red meter lead into cavity Attach bIack meter lead to armature plateSee Figure 4-20Crank engine lead from and observe meter readingand insert into cavity Crank cavity gine and observe meterreading either test means sensor coil is shorted to groundLoreplace sensor coilcate short and repair, check sensor coil output, bIack lead from armature plate and insert into cavity of connectorSee Figure 4-20Crank gine and observe meter readingIf meter reads 0.3 Output Testhigher go to Power Pack
ure 4-21Connect meter bIack lead to engine ground Connect meter red lead to metal part 01 jumper lead com ing from power pack cavity Crank engine observe meter readingConnect meter lead to metal part of jumper lead cavity Crank engine observe meter readingIf meter reads 180 coilcoilshigher, check ignition