Warning signal on Merc 89 100 hp

While running the warning signal started chirping, I think it is the oil pump. It would signal about every second. The reason I think because the water pump signal. Was louder and stayed on. What do you think. The oil tank was half full. Engine not smoking at idle.

It was the oil tank, took it in to M&W they replaced it for me. Will check it out tomorrow.

..I just finished replacing the oil tank in my Mercury 60HP tiller.....pretty easy fix. Now I don't have to worry about the low oil level alarm.....it functions like it was designed to.

I have a 1996 Merc 60hp tiller. This same thing just happened to me. I contacted the dealer and he told me exactly the same thing same that 2nd Shift described below. I too have purchased a new tank; plan to install it this week because next week we leave for our final week of soft water fishing the TFF.

Checked oil flow at fuel pump while running engine, no smoke. Took oil line off at fuel pump, no oil flow. Thanks for the responses

I have had this happen and it was the batter voltage. I have Mercury Smart Craft System and it starts blinking low battery voltage so it cuts thought the guess work. I posted a thread a while back on alternators pricing I was amazed. However make sure that it is still oiling as years ago I had one quit oiling and it did a major melt down.

Is your battery voltage ok? If thats low it can set alarm off too.

I had the same thing happen on my 1999 125. The oil tank was half full but the alarm was going off. I looked around and found info that said to disconnect the wire going to the bottom of the oil tank. If the alarm stopped it was a bad sending unit. It did. No more alarm. Mercury decided to glue a magnet to a float inside the tank. After years of soaking, the glue let loose and the magnet dropped. That told the sensor the tank was empty. The only cure was to replace the oil tank. There's no way to remove the float and magnet without cutting the tank apart. Option #2 would have been to leave the wire disconnected and keep a close eye on the oil level. I chose to replace the tank.