1989 Johnson/Evinrude Outboards 88 thru 110 150 thru 175 models Service RepaIr Manual P/N 507757, Page 146Get this manual
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7 The engine must
3 Install junction at timer base starboard mh connectors 4 Switch peak-reading voltmeter to "POS" andAttach meter red lead to junctionterminal "" and meter bIack lead to clean