1978 Johnson 175, 200, 235 HP Outboard Service Repair Manual P/N JM-7810, Page 52Get this manual
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IGNITION SYSTEM TESTS USING NEON TESTER
Output CI1eck
STEPCHARGE COIL OUTPUTSet nn tester knob to number twoRemove output leads terminal #4 and #5 and connect neOI1 tester ac