1971 Johnson 60HP outboards Service Manual, Page 88Get this manual
SlllFT CIRCUIT CONDITION 1Cannot shift out of forwardJumps out of neutral or reverseBurned out blocking diodeBlown fuseno apparent reasonREASON Shift toggle switch Shift solenoids Engine wiring Shift diodes Rectifier assembly Blocking diode
2Lower unit "shifts" into forward before engine stops when
key is turned off 3Cannot shut engine off
TROUBLE SHOOTING STEP 1SHIFT SELECTOR SWITCH aConnect 12 volt test light between green lead ill and common engine groundbKey switch onShift lever in neutralcLight should lightdRepeat test at blue lead Use shift reverse pqsitioneIf no light at or move test light to purplegreen lead at terminal blockfIf light lights, shift toggle switch badgIf no light at purplegreen terminal, check blocking diode, ignsw fusebattery
STEP 2BLOCKING DIODE aKey switch off positionbConnect one ohmmeter lead to purple leadConnect other lead to purplegreen lead shift switchcUse high ohm scalenote readingdReverse test probesnote readingeOne high reading, one zero reading, blocking diode okfBoth high readingsdiode opengBoth zero readingsdiode shorted