89 Evinrude 120 VRO Wiring Issues

[Harritwo]

89 Evinrude 120 HP with VRO. When I bought the boat, the VRO wiring had been cut. There is no evidence of where the wires went on the Engine but they are on the oil tank. When I start the engine with Premix from a test tank, the LOW OIL alarm is constant.

Can anyone tell me where these wires belong? Not sure yet if I want to connect the VRO, make the alarm go away and just use Pre-mix or what.

George

 

[ob]

Your description is confusing. Describe the alarm you are getting. Constant tone, rapid short tones ?...... because the low oil vro alarm is not a constant tone..

 

[oldboat1]

This is from up in the top secret files (top of the forum): http://maxrules.com/graphics/omc/wiring/1988_89_120_140.jpg

Water pump been replaced?

 

[Harritwo]

The tone is a constant. When i unplug the VRO pump wires (3 wires) the alarm goes away. On the VRO Tank, there are 2 black wires that were cut. I can find no evidence of them on the engine anywhere.

 

[ob]

Has the oil half of the VRO pump been disabled?,as in the oil line been plugged off and engine is setup to run premix? If so, then the three wire VRO pump connector needs to remain unplugged. You'll the have to decide whether you plan to run premix or place the not too reliable three wire VRO system back in service.

 

[Harritwo]

The oil line is plugged, the 3 wire is unplugged. I intend to run pre-mix and remove the VRO tank and hoses. Gas tank will be coming out and cleaned before going back in. Everything seems good with this configuration. Water pump pumps water, but is getting replaced next week along with the shift cable.

All battery cables were corroded and have been replaced. Starter has been rebuilt, Carbs have been rebuilt/cleaned.

 

[ob]

So, with the three wire VRO harness unplugged I'll assume as you stated above that the constant alarm goes away. If so that's all good. Now what you will want to do is confirm that the engine overheat sensor is operational. You can test it by locating the tan wire that exits the sensors near the top of the head covers and with the key in the "on" position , engine not running, ground the tan wire to the block and confirm that the warning horn sounds. Usually this tan wire will have a sleeve that can be peeled back to expose the metal of the connector to perform this. If not you'll have to back probe the connector with a test lead to ground.