Einstein believed that energy was neither created nor destroyed - it could only change its form. Ultimately, your Ford F150 electrical system is powered by ancient sunlight that stuck the earth over 300 million years ago. This sunlight was stored in plants that lived, then died and eventually were buried under the earth, where tremendous pressures transformed it into "rock oil," or petroleum.

Refined, this becomes the gasoline in your tank, which burns in the cylinders, driving a belt that in turn powers a device that converts this mechanical energy into electrical energy. This device is the Ford F150 Alternator.

Its purpose is to generate electricity when the engine is running. Energy not used for the electrical system right away is stored in the battery, which is why you can start the car in the first place or leave the headlights on when the engine is stopped. That small red light on your dashboard or needle pointing toward the minus sign indicates that the Ford F150 Alternator is no longer charging. Usually, this is caused by a loose, worn or broken belt, which is easy to remedy. Even if the alternator itself has given up the ghost, there's usually enough electric energy left in the battery to get your truck home (assuming it's not night). An alternator will probably not last beyond 100,000 miles, so when you roll that odometer, keep us in mind for a great deal on a new or remanufactured Ford F150 Alternator. You are guaranteed the lowest price on any Ford part or accessory. If you find a lower price elsewhere, e-mail us the URL.We'll not only meet or beat that price, we'll pick up the bill for your shipping costs, as well!