1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Repair Manual, P/N 520210, Page 136Get this manual
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5 If Step key ON reading is low one, disconnect harness blackyellow lead from key switch "M" terminal If meter now shows high reading, replace key switch If meter shows low reading, go to Step 66 Disc