1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 276Get this manual
Troubleshooting Trim Gauge To avoid immediate meter damage, never apply an ohmmeter to an electrical circuit where voltage is presentG1 1Turn key switch ON and use voltmeter to check for voltage between trim gauge terminals "I" and "G If voltage, go to Step If no voltage, go to Step 2G1 2With key switch ON, check for voltage between trim gauge "G" terminal and Point V1 If voltage, check condition of accessory harness purple 16 gauge lead If no voltage, go to Step 3G1 3W!th key ,switch ON, check for voltage at key switch "A" terminal If voltage, check condition of remote control purple 16 gauge leads If no voltage, check condition of key switch and engine harness 20 amp fuse PIN 510884f1I 4Turn key switch OFFRemove trim harness leads from gauge terminals "S" and "G Calibrate an ohmmeter on low ohms scale and connect between the leadsTest results should be engine fully downapproximately 88 ohms, engine fully up approximately ohm If your values are the same, replace trim gauge If your test results vary, go to Step 5G1 5Repeat test in Step at connector C3 If your test results are correct, check condition of trim harness and connector C1 If your test results vary, replace trim sending unitU