Re: Blower Motor Resistors
All kinds of crud and moisture manages to accumulate where the resistor is located - no surprise that it manages to rust out and/or otherwise fail.
A friend has an auto parts store and they keep all kinds of blower motor resistors in stock - it's a common failure point on any number of automobiles.
Usually the first sign of failure is only one speed working (usually "high") on your blower fan.
BTW, while you're in there changing the resistor, use lots of dielectric grease on the connector, and for good measure, you may want to consider siliconing the heck out of any entry points for moisture along the harness.
Also, you may want to periodically check up on how much crud is building up in there - it's not all that difficult to get to - it just takes a bit of time.
2003 Supercab Flareside
4 liter V6
4x4 FX4 Level I
5 speed Auto
4.10 LS Rear