1993 Johnson Evinrude "ET" 90 degrees LV Service Repair Manual, P/N 508287, Page 174Get this manual
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STEPSENSOR COIL TEST Ground Test
[!!I 1 Set peak-reading voltmeter to "POS" and "5"" SEN" and "5" on Stevens CO-77 meterr:Jil Attach voltmeter black lead to port timer base connector, terminalE"