1988 Johnson Evinrude CC 60 thru 75 outboards Service Manual, Page 95Get this manual
VRol Warning "Low Oil" Signal
Signals
A complete for testing the "low oil" circuit can be found in VROi Installation Recommendations, this Section
1Connect shop tank with 50:1 fueloil mixture to the fuel inlet fitting2Carefully disconnect the oil supply hose from the VRO oil inlet fitting3Start the engine and run at 1000 RPM in gear4After the residual oil is exhausted from the VRO oil pump, the "no oW' circuit should activate the control box warning horn 5The signal should be approximately 1 second on, 1 second off6If the horn does not sound within five minutes, check the Amphenol connectors and the tachometer circuit Check the boat's tachometer or temporarily attach known good 7K tachometer to test the tachometer circuit7If the tachometer circuit and the warning horn circuit are are okay, replace the VRO pump