Connecting the motor to 12/2 wire and a 6 position dial in an evaporative swamp cooler
First u can run a second 12/2 wire to get lo (red)
Black is hi
White neutral an green ground
Wire accordingly

Ck utube video. Guy does a good job show n tell on hookup

Also ck switch with power off using an ohm metrr an see if u get the proper reads