heater switch help !

[ladz]

Can someone tell me how the switch settings work ? We have the plug into the switch and the other end has a plug end also ! If i power the red wire to the switch the variable speed does not work, it only works on hi or off ! There are four wires coming from the switch , low , med , high speed and power ! What i do not know is where the setting for the speed wiring went too !

[kknip]

I'm not exactly sure what you are describing,but there is a resistor in the heater box that the harness plugs into.The resistor controlls the fan speed.

[68F250]

See if this makes sense:

http://www.fordification.com/images/sch ... heater.jpg

The two resistors are for the low and medium speeds, no resistor is high speed.

[ladz]

I know there was something i for got ! All done , thanks its pretty tight back there