Well actually, that diagram did not describe my truck. After much research and salvage yard discussion, it turns out that my truck has a resistor pigtail in the wiring coming off the blower motor. Where the blower motor plugs in for power also includes this resistor. On my truck this part number is EIEB 14A459 CC. Apparently you can only get a new one by buying a new blower motor because it is made in with the power cord. Unless anyone has information otherwise?
1994 Ford F150
3.42 rear end