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In older cars, like your stock mopar for instance, your alternator was paired with a voltage regulator which prevented your alternator from over charging your system. Nowadays the voltage regulator is built into your car alternator, so you don't have to worry about wiring to and from the voltage regulator and alternator (as you will soon learn, fewer connections makes for easier troubleshooting!). If you have an older car, it is advisable to replace both of these parts with a newer version. Old voltage regulators can be tweaky, and it is really best to take them out of the loop if you can.