Mercury oil alarm

[nautidawg1968]

I have one of those annoying oil alarm problems on my 1998 Merc 150. Never cuts off no matter what I do. I've read this forum extensively about possible causes and solutions, but can't seem to resolve yet without spending hundreds of dollars switching out parts. Three questions:<br /><br />1. If turning the tank mounted cap sensor upside down (so that the float is fully up) does not cause the alarm to cut off, does that rule out a problem with the cap sensor?<br /><br />2. If I take the oil sensor off (i.e. the one mounted just above the oil pump) and put my finger in the slot where the sensor was, should I be able to feel the pulse with my finger, or is the pulse too weak to feel manually?<br /><br />3. I read in one thread that a "faster" pace beeping (as opposed to a continuous beep or slower intermittent beep) means that the problem is definitely in the alarm module. Is this true? Mine beeps very fast and even does so when key is in "on" position but engine not running.

 

[WillyBWright]

Re: Mercury oil alarm

Welcome to iboats. <br /><br />Bad modules indeed beep very rapidly, constantly, or have ghostly beeps when they fail.

 

[Rockonafly]

Re: Mercury oil alarm

This is a synopsis of the 60 Hp manual tests:<br /><br />1. Check the oil level switch for continuity, if it has continuity with oil in the tank it is the oil level switch.<br />2. Disconnect temperature sensor and turn key on if no alarm it is the temp sensor.<br />3. If the previous two are ok it is the alarm module.<br /><br />It happened to me 10 minutes of testing and I had the cause. Mine was the alarm module.<br /><br />Rockonafly

 

[nautidawg1968]

Re: Mercury oil alarm

Thanks Rockonafly. This may be a dumb question but how do I test continuity on the oil level? I have a continuity tester and a multi-meter, but I'm not sure where/how to place the clips.