My wash down pump draws 20 amps. Depending on what yours draws, I would expect the voltage to be around 14 when cruising unless you are maxing the alternator out with load. I would also reevaluate the washdown pump. With mine, when you close the spray nozzle, there is a pressure switch that immediately turns the pump off. From what you posted, I'm unclear whether water was flowing or the pump was dead heading against a closed valve.
Ted
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