1995 Johnson/Evinrude Outboards 40 thru 55 2-Cylinder Service Manual, Page 293Get this manual
6With the engine running at 1000 RPM, disconnect the tachometer and observe the voltmeterVoltage should increase approximately voltDisconnect the VRO pump's 4-pin Amphenol connectorVoltage should increase approximately volts If the voltmeter shows higher voltage than specified on both components, replace the rectifierregulator If the voltmeter shows higher voltage than specified on one component, replace that componentDo not energize primer solenoid when performing Steps 7, 8,and9f31 7Check for voltage at the gray terminal with the engine not running and the key switch in the "ON" position If the voltmeter does not show voltage, the tachometer circuit is okayCheck the warning horn circuitRefer to Warning Horn, Section If the voltmeter shows voltage, go to Step 8 Gil 8With the engine not running and the key switch in the "ON"
position, disconnect the gray leads from the terminal boardCheck for voltage at the rectifierregulator gray lead If voltmeter does not show voltage, go to Step If voltmeter shows voltage, replace the rectifier regulator