1991 Johnson/Evinrude EI Outboards 2.3 thru 8 Service Repair Manual P/N 507945, Page 100Get this manual
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bIack lead to clean engine ground.lfthe coil is not mounted
r:::-=J 00 not exceed the coil's maximum specified amperagewhen testing the coil612 3, 3.3 Connect the bIack lead of the tester