I'm replacing the motor on my evaporative cooler, which is a 2-speed motor. This one from Vevor is a 4-speed, so it has additional wires. On my cooler there are 3 wires - black, white, and red. The red wire is supposed to put the motor into low speed. I've connected the black wires together and the white wires together. That leaves the blue, red, and gray wires coming from the new motor. I've tried connecting the red wire from the cooler to each of the blue, red, and gray wires on the new motor, but it will only run at high speed. I'd like to be able to run the cooler at low speed sometimes. Any ideas? Thanks.