Original coil would overheat if it got 12 volts at all times. Thats why Chrysler used 2 supply wires with a ballast resistor in one of them. e-coil can run on constant 12 volts. If your aftermarket wiring harness isn't built for Chrysler, with the hot in start and hot in run wires, the Chrysler ignition switch will not cooperate unless ignition 1 and 2 are tied together.
