Your original alternator keeps your Toyota Avalon running long after the sedan's battery helps it start up. What an alternator does is maintain consistent power between your battery and the rest of your car's electrical systems. However, even high-quality factory Toyota Avalon alternators can fail. There are signs an alternator is going bad, but it can happen too suddenly for warning. Symptoms like headlight flickers, your in-car entertainment system not working right, or a burning smell can all indicate it. You can also see an alternator warning light turn on, hear your engine squealing, realize your battery's dead you could even cause alternator failure by accident, by improperly jump-starting the car or incorrectly installing an accessory. Perhaps the worst sign you can get is total electrical failure. If you experience these problems, do a complete inspection and charging system test. When to replace an alternator isn't complicated, luckily: since they last anywhere from 80,000 to as many as 150,000 miles, make the change about every 7 years. The best alternator for your Toyota Avalon is OEM, as it'll be guaranteed compatible right from the factory. You can order one online at our auto parts store buy today and you'll have the project done in no time.