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Yup- this was the issue. Seems both pumps I received had blue as the negative, with brown being the positive. Now I'm trying to figure out how to reduce output from the pump. It puts so much water out, the catcher hardly even wants to reset, it just stays lowered, with water streaming over it (this is at 5v). I'm thinking I'll try reducing the voltage and maybe a small restriction in the pipe, but I'd prefer a PWM soution that would be less stressful on the pump motor.