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My hp pump does not run. Does the ground to the pump come from the resistor? Is the pump 12 volts so I can test it by jumping it out. The main relay is working and sending 12 volts to the pos terminal on the pump. I'm trying to figure out if I have a bad pump or not getting ground on the neg post. This is a 2004 225 V Max.
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I believe the pump has 12v+ on it all the time and then the negative goes to ground through the computer telling it when to run. Some times it takes it to gound through the resistor to reduce the voltage but I do not know when. You should be able to test the pump by jumping the leads and reversing the motor direction by switching pos and neg.
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