You wake up in the morning, get ready for work, and go out to your car. The key is in the ignition and you've cranked it, but nothing happens. It might be time to replace your Eagle alternator. Mechanical energy is converted into electrical energy by way of the alternator. You can try to use jumper cables on your battery to get the car started but if it's the alternator, then it'll only run for a few minutes. Many parts of your vehicle need the alternator to run. These parts include the lights, ignition coils, and engine fans. Other areas that depend on the alternator are the stereo and air conditioning system. The four main parts of the alternator are the stator, rotor, voltage regulator, and diode packs. If any one of these parts were to stop functioning properly, you would have to replace your alternator. Luckily, if it's just the alternator belt that's broken it can be changed without having to replace the whole alternator.