1971 Johnson 125HP outboards Service Manual, Page 39Get this manual
Pull spark plug leads off before proceeding with step 2-bpossible to fire any fuel left in cylinders after step 2-a
If neon lite doesn't flicker, connect atest sensor into the pulse pack plug as illustratedWith key switch ON, activate test sensor by passing feeler gauge or smooth metal object back and forth across its faceNeon lite should flickerIf neon lite doesn't flicker, replace pulse packIf neon lite does flicker test sensor circuit