1989 Johnson/Evinrude Outboards 88 thru 110 150 thru 175 models Service RepaIr Manual P/N 507757, Page 136Get this manual
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151 2739 STEPCHARGE COIL TEST
and clean
reading is indicated in Step 3, go to Output Test
Output Test 1 Set peak-reading voltmeter to "POS" and "500 f612 Attach PRV meter bIac