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The blower motor resistor is what controls the speeds of the blower motor. It is under the battery tray.. you have to remove it to see the resistor, and there is 1 bolt holding it to the truck, with a (2 wire) plug going to it.
You already have a used part, doesnt work so good. Replace it new and check the blower motor ,high amperage will burn out a new one. I suppose you need the Blower Motor Speed Controller. Just google it and find a salvage yard that will sell you one.
The low speeds(all of them) are distributed threw the fan speed switch to the blower motor resister.The resister is the problem.It is located very near the blower motor.It has two screws mounting it to the blower box.It has a plug in with about 5 to 7 wires.Unplug this plug to the resister.Remove the screws.Pull the resister toward you,it mounts and rest inside of the blower case,this is how it is cooled.Now when you replace the resister,replace the blower motor.Even if the bower motor is running fine, it is pulling to many amps for the resister.It will happen again soon,if you don`t replace the blower motor.If I can help you any more,please let me know.
Jeff, If I understand you correctly you say your blower motor only works on high? check your blower motor resistor, located next to blower motor. The resistor makes the other speeds availiable, high bypasses the resistor, let me know if that fixes you up
I know this problem and have delt with it several times in the past>>
It is your (((Blower Motor Resistor))) go to napa pick it up for 20.00 <<<< takes less than a hour to install right passenger side under dash>>>>>>>>>>>>
Please give me the highestrating on this I just saved you at least a hundred bucks
Ignition switch is the culprit. On Fords for high speed blower motor is direct whereas the lower speeds go through the ignition switch. If there is an issue with the switch the blower will only work at high speed. A schematic will confirm that.