1997 Johnsoon Evinrude "EU" 50 thru 70 3-Cylinder Service Manual, P/N 507266, Page 267Get this manual
Circuit Verification, OMC Tester, PIN 437274 Verify the condition of the boat modular wiring system using OMC Tester, PIN 437274Power to the tester is supplied by:
110 VAC adapter supplied with the testerOR Internal batteries (two rechargeable 6-volt batteries)To recharge batteries, move tester power switch to OFF position and plug in A.Cadapter
rn The circuitry in breakeris protected from an overload the tester condition by circuit
Verify condition of terminals in connectors of both the instrument harness and tester harnessThen, connect the tester harness to engine end of the instrument harness
rn Turn the tester ON for all testsImportant These tests must be performed in sequence and as complete procedure to ensure that the entire system is verified