1990 Johnson Evinrude "ES" 40 thru 55 Service Repair Manual, P/N 507872, Page 113Get this manual
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Troubleshooting Test Equipment
rJl Ohmmeter capable of reading
low (RxO.1), medium (Rx100),
and high (Rx10K) ranges Mercotronic No700 VOA Stevens NoAT-101