175 HP Mercury Won't stop beeping.

[bassmaster1981]

hey how are you? I have got a crazy problem with my current boat.2002 mercury efi.Just had it built and it started the 4 beeps every 2 minutes.Which is oil or water separator.Changed oil sensor and check for water and didn't fix it So then I changed oil tank.Still no help.Then took to mechanic and 0 codes .So I go to noticing you can let it idle forever and no beeps but you put it in gear then you get the four beeps.Also when running on pad if you hit the trim it starts beep cycle over.Sometime when you hit the trim it will give over heat alarm or long beep 3 short and throw it in guardian mode.Can cut it off star back and is fine.I am thinking I have a short butt can't find it or could ECU be going out.Would be great if you have any ideas

[lpugh]

Check all ground connections, there are several.
Test battery and charging system.

[EuropeanAM]

Moving your post to the 2.5L forum as I suspect that's what you have.

Please take a moment to review the Announcements at the top of that forum, and be sure to provide the Required Info (serial number) when posting. Thanks!