Trent, one of the biggest reasons for blower motor resistors to have shorten life is actually because of faulty blower motor drawing too many amps, some times melting wires/plugs, heating up resistors shortening their life. Many Dodge forums tell of this problem. Good luck.
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http://dodgeforum.com/forum/1st-gen-durango/318760-blower-motor-resistor-constant-burn-outs.html