Intermittent Warning Beeps, 2002 Nitro

[RickS]

I have a 200hp Mercury carbureted engine. It runs great, but when I'm on a plane and hit any waves >6" (particularly causing side to side motion), I get random warning beeps. I've tested continuity across the oil reservoir sensor, no issues. Disconnect the oil sensor entirely and still get the beeps. I don't see any voltage drops when the beeps happen, have a full tank of fuel and oil is full. Any thoughts on where the short would be?

 

[cq]

Have you checked at the alarm itself?

 

[firedog978]

I'd check the water intake to the pressure gauge. It may be a low water pressure signal. Does your water pressure drop when it beeps?
The hole on the lower unit forward may be partially obstructed. it can get gunked up.

 

[RickS]

The water pressure is holding steady. I'm back to thinking it's an air leak in the oil reservoir system somewhere, even though I though I'd disconnected the sensor. It looks like there was enough of an air gap in the reservoir that it could have caused an occasional alarm, so I bled out the oil this weekend, and it seems to be doing ok now. I'll look more carefully for cracks in the hose or caps!