1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 315Get this manual
WATER TEMP Circuit
1Separate the connector between the engine harness and the temperature switch[] 2Using jumper wire, connect the engine harness tan lead to clean engine ground
3Turn the key switch to ON positionAfter the normal self-test
sequence, the gauge WATER TEMP light should stay on If WATER TEMP light is not on, troubleshoot tan circuit for an open in the engine harness or the instrument harness4On engines, test both temperature switch tan circuits
5To test the temperature switch itself, refer to Temperature Switch, Section 46Turn the key switch OFF and reconnect all circuits disconnected during these tests
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: