1970 Johnson 115 HP Outboard Motor Service manual, Page 40Get this manual
TESTING SENSOR CIRCUIT
aConnect ohmmeter leads to sensor wi plugA 4-6 ohm reading indicates sensor circuit is "OK" While meter is connectedwork wire back and forth for indication of loose connectionsbConnect one meter lead to groundClose and open throttle to shift anti-reverse spring from groundMeter should read least 100,000 ohmsWhile meter Is connected, work wires entering the distributor
base back and forth for indication of gr ounds
cIf sensor ohms checks "OK" remove flywheel nd check sensor ,028 air gapTighten senSOr and base plate cOlUlections to prevent high speed missInspect dist ributor cap, rotor, and high tension leads for crackscarron trailsand corrosionNOTE: cracked or leaking distributor cap andor otor, leaking high tension leads, may prevent spark from eaching spark plugsCheck carefullyStep No