Yes there is a junction on the harness, but one of those wires as the diagram states is a (resistance) wire in this case the white wire. Now if I'm getting 4ohms at the black wire logically I should be getting a higher resistance on the white wire which should make the motor turn at low speed, no? In my case both wires give me 4 ohms, I tested the switch and it works correctly and the motor works also but as stated just one speed (Hi)

Later, BUZZ