Batteries start vehicles, but another auto part charges them in the first place: an alternator. As part of its charging system, the one in your Toyota Matrix runs your hatchback's many different electrical systems. In fact, a good factory Toyota alternator can mean the difference between your dash display and headlights lighting up, your power steering, windshield wipers, and power windows running, and your car radio playing -- and nothing working at all. Alternators even power luxury features like heated seats. How does one work, though? Put simply, they turn mechanical energy into electricity. More complexly put, they capture and distribute power transformed from AC to DC by a rectifier. The process starts with your engine, a drive belt, a pulley, and a rotor shaft and ends with spinning magnetic coils, but most importantly, it's your alternator that starts and keeps your car running through it all. Unfortunately, though, even Toyota alternators can go bad, sometimes without warning. Causes range from broken-down parts to plain old age. You can even cause alternator failure yourself, simply by jump-starting wrong or trying to install the wrong accessories. Luckily, symptoms are easy to spot. They include flickering headlights, car radio glitches, a burning smell, a whining engine, and even a dead battery. The most obvious sign of alternator problems is probably total electrical system shutdown. If you think your Toyota Matrix alternator has issues, inspect it, test its charging system, and if needed, replace it. Otherwise, you change an alternator about every 7 years or 80,000 to 150,000 miles, roughly. Double-check your owner's manual to be sure. When it's time, be sure to buy a genuine alternator. After all, one made by your OEM specifically for your Toyota Matrix will fit it best. Our auto parts store can ship you one in short order. Buy online today!