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Behind the board where the relay box is mounted you will find many cables wound up. Most will have a resistor on the end. It is not possible to know which is which by looking. You will have to unplug the resistor out of each one and with a circuit tester see if it has power. I had somebody else pressing the buttons on the pod and when my mulimeter showed 12 v, I knew that cable was connected to that button. They were all the same color (empty, fill, shower). the one that has 4 cables is for the heater, the single yellow one is for 12 volt accs button. If you are using centrifugal pumps, you can use it directly, you are safe if you are using the 1200 gph Tsunami, they only draw 4/5 amps. If you are going to use impeller pumps, those draw much more power, I would use the button to a relay and then use direct power to the pump. You don't want to blow up that expensive box!
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