Have you tried them on another 12V ACC socket thats independent of the boat?
Have you check the voltage level in the ACC socket on the boat?
Next, check the voltage at the pump motor. Bad plug can drop voltage and slow motor.
These will run "bakwards" but the angle of the impeller means they wont move much water. But, if they worked last year and nothing has changed, then its the motor or the ACC socket. Since two pumps are not working well, I suspect the socket.
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