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I have a question regarding the galley and shower sump pump that pumps water overboard once it reaches the sump. the sump will work only if I have the panel switch on but will continue to run unless I turn it off. Is this normal? Should it only activate the pump if the float is engaged? If i don't have it on the water over flows the basket and end up in the bilge mid which ends up smelling. The pump and basket are new. Is this the proper way the sump works or do i have a wiring problem?

I bought the boat used and its always run this way.

Thanks for any comments.