Hi
if theres only three wires , green, black and white then the green wire is a ground which goes to an exposed metal exterior screw on the pump. It doesent matter which way the black and white go, it will work either way but if when you try to attatch the connectors theyre harder to attatch one than the other then switch it to the most easier way to attatch. Make sure to connect the green ground wire, it is very important and always try plug the shampooer into the bathroom where the ground fault plug is- its an added level of security in case theres a ground fault.
J
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