that resistor is somewhat open when cold to provide the coil almost 12V, when it starts to warm up, it starts getting more resistive, cutting voltage to the coil to about 6V to prolong the life of the ignition. Many have had to jump this resistor when it opens (cracks) to get the motor started and get home or to a auto parts store. Every Person who's had this happen usually keeps a spare one in the glove box or trunk. Its a Mopar thing...few understand. :)
