1998 Johnson Evinrude "EC" 125C, 130, 200, 225, 250 90 deg LV Service Repair Manual, P/N 520212, Page 172Get this manual
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STEPRUNNING OUTPUT TEST
4 Set peak-reading voltmeter to "POS" and "500"
5 Connect voltmeter red lead to No.1 terminal extenderConnect meter black lead to clean engine ground