From the Rule website: Auto function pumps, current draw while sensing:
AMP HOURS PER DAY
They apparently have 2 wiring schemes; fully auto pumps which require power and ground only (I assume switching it on puts it into auto mode; no manual on mode available), and one with a 3-wire setup (manual on/auto.)
On the 2 wire setup, there is no way to disable the auto function except by removing power to the pump.
On the 3-wire setup, well, if the pump works, it has to have 12V and Gnd, so the third wire will be your culprit.
willhave the info you need (though it's not exactly easy to find...)