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I'm trying to figure out the wiring hookup for the high and low speeds for the main pump. I am replacing an old Nu-Wave MM-1 spa pack with a new Balboa VS500Z (50-54219-Z). I've identified the high and low speed wires going to the pump. (Inside the old controller box, they were black and red, respectively.) I need to remove the old wiring and install the new wire/plug assembly, but the Balboa manual does not specify which is which on the four pin AMP socket on the circuit board. The manual shows the bottom pin is grd, the second is common, but the 3rd and 4th are not specified. The 4th(top) pin is a D shape hole with the flat on the left. The third is round. The corresponding pin on the "21087" wiring harness plug has the red wire attached to the 4th pin and black is to the 3rd one. So, which are the high and the low speed pins? from bottom to top looking at the connector on the circuit board: 1 - ground 2 - common 3 - ?? 4 - ??
