'05 Mercury 150 Optimax alarm question

[ward cleaver]

I'm getting 4 beeps every 2 minutes and solid alarm when revving past idle.
I tried flushing the system with a hose. the water pressure gauge reads 10 psi and am getting a good stream from the tattle port. I installed a Racor water fuel separator and replaced the under-cowl filter. I bled the under-cowl oil reservoir but the alarm persists. Next I'm going to try a new oil reservoir switch and clean the large oil tank pick-up screen. If this doesn't fix it she' going to the shop for a diagnostic.

[boats.net]

Low oil warning or water in fuel separator filter warning is 4 beeps every two minutes. If no oil to oil pump then will be constant alarm.

[ward cleaver]

Thanks. I mixed in another brand of injector oil because it was low and that's all the boat shop had. I'll try draining my large oil tank, cleaning the pick-up screen and refilling with quicksilver DFI oil.

[ward cleaver]

It was the under cowl oil reservoir. the magnet came un-glued from the float.
I replaced the reservoir and the alarm stopped . seems like Mercury knows about this as there is a new replacement part number, (recall?)