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warning alarm

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I have an 2005 mercury and my warning alarm will not stop.
My motor is not running hot and my oil is full has anyone had this problem
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is it a steady beep or short beeps?

if it is short beeps it may be the oil level module...they go bad and you may need to replace the oil tank

I just had to do this
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   gauger
I just remove the alarm from the control box. Been driving boats for years without an idiot alarm,
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   bluecat
I just had this problem and all it was , was trash stuck in the thermastat....
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   Iceman
My brother in law has a 75 Mariner and he is having the same problem. His is in the process of getting fixed, so I will tell him about your post and he'll be able to tell you what the mechanic said was wrong with it. His was not running hot either. I just can't remember what part it was that went bad.
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   YatYas
Found this on continouswave.com, I have the same problem.
Unfortunately the module just sounds the same alarm no matter what part of the oil system is signalling. If the alarm is a steady BEEP, it is an over heat alarm. If the alarm is a BEEP BEEP BEEP, it is an oil alarm, and is caused by either:

--oil level float switch in reservoir

--magnetic sensor in oil mixing pump input drive shaft has stopped rotation

--a defect in the alarm module itself (apparently a common failure)

Because there are no indicators and the cadence of the alarm tone is the same, you have to deduce which sensor is causing the problem.

You can deduce if the problem is the oil level in the under-cowling reservoir by checking the level. If the level is at its normal condition, almost full, the float switch could be signaling a false alarm. You can check this with a meter to see if the switch is actually signaling an alarm.

If is much more difficult to assess the motion sensor. Monitor the output of the motion sensor alarm and verify that it produces an output pulse of 5-volts for every two rotations of the engine crankcase.

If the motion sensor checks out, the next step is to change the engine's fuel supply to a pre-mix 1:50 oil:gas ratio source, and run the engine. You then disassemble the oil pump output hose and check to see if it is actually pumping oil.

If, after all of these checks, the alarm condition persists, you conclude the alarm module itself is defective and replace the alarm module.

Hope this helps.
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I am having the same problem on a 2005 Mercury 150 EFI. It is constant beep BEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEP. It seems to only happen when trying to take off again after idling for a while (e.g. no wake zones) and if I turn the motor off and restart the alarm ussually goes away. I have changed the water pump and thermostats and my next move is to change the poppet valve.
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   YatYas
Another thing to check is the cap on the oil reservior under the cowling for cracks or a broken seal.
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   Iceman
I talked to my brother in law who is having the same problem. His mechanic told him that the rectifier is bad and is causing the alarm to sound. I've never heard of an engine part called a rectifier. He has not gotten his boat back though, so I don't know if this was in fact what was wrong with it.
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I had the same problem. Mechanic changed the water pump, still got a buzz. He then changed a shift switch. That did it. No idea why that did the trick, but it did.
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