High Water Alarm Sensor


Onyx

New member
Can anyone tell me where I can find the high water alarm sensor in the engine compartment? I have a 2011 400SS.
 
Not sure there is a sensor. The high water alarms are usually a bilge pump switch that has a time delay in the circuit. When lifted, it may take about 10 seconds or so to sound the alarm mounted under the dash.
Mine is identical to the bilge pump float switch.
 
I don't know if this is any help. I have a 2002 370SS. There are 2 high water sensors in my bilge above my pump floats. But there is also one under my mid-birth floor at the shower box. It is a access panel under the mattress. I know because my shower box pump stopped pumping and flooded my compartment at the shower box tripping the alarm. Hope this helps!
 
2012 370SS High Water Alarm Sounding Off

Hello,

I'm having a similar problem with my high water alarm sounding off. I removed the access panel under the main berth and there is no high water in the sump box or cabin floor.

In the sump box there is a float switch which works fine and one on the bilge pump which works as well. Does anyone have an idea why the alarm is sounding off?
 
The sensors on my 350 CBR for high bilge water look something like this:

Screen Shot 2018-11-05 at 9.04.02 PM.jpg

They are thin panels and when enough water gets under the flap, it triggers the alarm.

Location is on the stringer in the engine room, and then there's one near the shower/cabin sump area as well.

This past summer, the alarm went off, even though the bilge was dry. Formula replaced it, and let me know that from time to time, these sensors can short out (and thus sound the alarm...which, btw, will let you and the rest of the world know you're sinking).
 
Thanks FastMarkA that is exactly what I have on the cabin/shower sump area. I’ll look for the one in the engine bilge.
 
The sensors on my 350 CBR for high bilge water look something like this:

View attachment 9088

They are thin panels and when enough water gets under the flap, it triggers the alarm.

Location is on the stringer in the engine room, and then there's one near the shower/cabin sump area as well.

This past summer, the alarm went off, even though the bilge was dry. Formula replaced it, and let me know that from time to time, these sensors can short out (and thus sound the alarm...which, btw, will let you and the rest of the world know you're sinking).

Same thing on a friends 2017 370 SS. High water alarm went off when everything was dry and we were looking for floats. Determined he had new style sensors as FastMarkA stated.

I wonder if there is going to reliability issues with these sensors. This past summer, me, my friend's 2017 370 SS were in a group of boats taking a week long trip. A couple days in, my friend's first high water sensor went bad. Figured out which of the three was bad (starboard bilge) and unplugged it. A couple days later the cabin bilge sensor went bad and we unplugged it. Needless to say he was a little nervous finishing the trip with one high water alarm sensor operational. He called Formula after the second one went bad and to their credit, he had three new sensors waiting at his doorstop when he got home. He said they looked the same so I don't know it the replacements were updated at all but I feel confident that if there is a problem Formula will be on the supplier to fix it.
 
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2005 400SS engine bilge switches are in the front of the bilges. The two lower ones are the operational switches for the pumps. The upper two are the alarms
 
I chased one on my 400 in the engine compartment the very first summer I owned it. It went off so often the damn marina tech cut the wire under the dash on me! I guess he couldn't figure out how to trip a breaker. Any way, it is the picture you see above, they go bad often and are located in the bilge area under your engines. Not fun getting in there and to them. Formula support (TAG)told me they can often get a scum build up that affects their function and a quick simple spray and wipe helps.

Just to complain about them more, my 430 had a bout 15 hours on it when that sensor went bad this summer as well. Of course, being Formula, I had a new sensor a few days later. They are great when you need them, and hopefully none of us ever do. But otherwise they are a PIA - kinda like CO2 sensors!
 
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