1998 Johnson Evinrude EC 50 thru 70 HP 3-Cylinder Service Manual, Page 267Get this manual
Circuit Verification, Instrument Harness To make sure the OMC System Check engine monitor can alert the operator during LOW OIL, NO OIL, FUEL RESTRICTION, or engine OVERHEAT condition, it is very important to verify the condition of the sensors and associated wiringTest the engine monitor regularly and anytime you suspect an alert situation has been missed
Notel Notel
The instrument harness must be connected to the engine before performing the following testsVerify the condition of all wiring and connectors before proceedingThe warning horn will not sound while in the diagnostic mode42811
rn to testI the warning wires made with the appropriate termiINote Use jumper nals circuitsSystem Check Gauge
1Turn the key switch to ON position, engine not running