Mercury oil tank level sensor 4 beeps every 2 minutes.
Mercury oil tank sensor.
Mercury oil tank vent cap mercury mariner 50hp 60hp 75hp 90hp outboard 19299a1 14 99 new mercury marine mercruiser oil tank switch sensor 87 856156t04 87 856156a4.
I also came through same kind of problem few days ago.
You can fix the problem by replacing wire to the horn for solving this particular problem or by replacing the sensor that measure the oil level in the motors.
There are many complaints by the users of mercury motors.
Low oil sending unit stuck on creating alarm from control panel.
So your mercury outboard is experiencing the common problem of the alarm beeping 4 times every 2 minutes.
The oil level is full and you replaced the oil level switch but the problem will not go away.
If you have a steady alarm going off but the oil is not low it is most likely the oil sending unit.