My blower motor only works on what I think is medium speed The resistor appears to function properly. It seems as if there are four positions for the switch(not including off). There are two separate wiring plugs attaching to it. Can someone explain the exact, correct way this switch should functio?. I'm confused as to wheather it is supposed to work or not with the a/c lever in off. I have the switch out if there is a way to test it.