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Though without A/C or a stereo, the car still has a strong current draw, thanks to an electric water pump, fan, and high output ignition system. An MSD alternator provides the amps necessary as well as the 13-plus volts specified by MSD for their ignition boxes. Quite often the old externally regulated Leece-Neville alternators that came as factory items on the Mopars only put out 35 amps, tops. That is barely enough to run the lights and wiper motor-not enough to correctly power a good ignition system.