Just FYI - I replaced the 2 speed SPA pump in my Viking SPA. It worked fine on low, but on high the noise level went up at least 3 volumes, and the high speed flow was barely above the low speed. It would not even spin my spinning SPA jets. I tried to reverse the red and black hot leads, leaving the common in the middle terminal, but that just made high low and low high reversed. So I switched them back and presto, it worked. ???? My conclusion was that the red terminal was just not making a good connection so I crimped it a bit and it works fine now.