Just got my SCR 3300 to the lake for the first time have it in the driveway and noticed when I turn the batteries on sounds like there’s a pump running under the toilet. Can’t figure out what it is. I open the hatch from the aft cabin so you can look under the floor it’s not that pump. Any help would be appreciated thank you.
Do you have water in the bilge? If it's your water pressure pump running all the time you have a leak somewhere. It should only turn on when water is being used.
Do you have a shower sump? It could be the sump pump float is stuck open or there is a switch that is on.
The fresh water pump is located in the starboard side cabinet in aft cabin beside toilet below the floor ,turn off switch beside fridge and see if noise goes away