1992 Johnson Evinrude "EN" 90 deg. Cross V Service Manual, P/N 508145, Page 293Get this manual
6With the engine running at 1000 RPM, disconnect the tachometer and observe the voltmeterVoltage should increase approxi mately voltDisconnect the VRO's pump 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 component1al 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 Test, Section If the voltmeter shows voltage, go to Step 8f.il 8With the engine not running and the key switch in theON" 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 rectifierregulatorf51 9With the engine not running and the key switch in theON" position, connect voltmeter to engine wiring harness gray leadDisconnect the tachometer from the circuitCheck to see if voltage disappears, tpen disconnect the VRO 's pump 4-pin Amphenol connector and check voltmeter If voltage disappears after disconnecting component, replace that component If voltmeter shows voltage after disconnecting both components, substitute the remote control wiring harness with known good harnessIf voltmeter still shows voltage, replace the engine wiring harnessThe "low oil" and "no oilsignals alert the operator to possible VRO problemsTo prevent possible serious powerhead damage, you must be sure these signals are working Replacement of RectifierRegulator