ALARM?

[JCSkeeter313]

Hey everyone. I got a 1989 Mariner 175 Pro-V. when i start my motor the low oil alarm starts beeping constantly. my onboard and external tanks are full. does anybody know whats wrong and what are some tests that i can do diagnos the problem. thanks for any info.

 

[Laddies]

Re: ALARM?

It sounds like the oil module has failed, happens quite often when the units get 5 or 6 years old

 

[scroungey]

Re: ALARM?

Does it only sound when running or when the key is turned on and the engine has not been cranked?<br />If it is like my 90 hp Mariner then you can check if the sender is bad by shorting the two leads that go to the probe in the oil tank, and if it beeps then the sender is good. The probe may be bad, but if it is like what I just went through, then the magnet on the bottom of the float in the oil tank has come loose and is resting on the bottom of the tank. And the probe can be checked by leaving it connected and running a magnet over it, if it sounds, it's good.

 

[JCSkeeter313]

Re: ALARM?

it doesn't beep when i just turn the key but once i start it and it is running is when it beeps. im not quite sure what you mean when you say to "ground it" i have a good voltmeter so i think i can do it. also did you get a new cap or just "fix it" another way. what did the cap cost if you got a new one? do you know what the oil module is by any chance?

 

[92mariner]

Re: ALARM?

I had a similar problem Last year. Replaced the Oil cap for no more than $15. It was actually cracked and when the engine ran it sprayed out just enough to trigger the sensor. Good starting point to troubleshoot the problem.

 

[scroungey]

Re: ALARM?

If the probe has two leads, they will be of the same color and can not be reversed as they will work plugged into either side. If you jumper those two coming out of the sending unit then you are duplicating what the probe does. If the sending unit beeps, then it is good. The probe has the corresponding wires mounted inside an epoxy type tip, and when the magnet on the float moves up or down then it provides some resitance and makes it beep, this is what the magnet does if you hold the probe. Of course if the problem is in the oil pump or as some engines has a motion sensor to determine if the vane if turning, then all this is not what you need. But it is a starting point.