A dead battery rarely acts alone. When a vehicle refuses to start, most people blame freezing temperatures or an old battery and move on. But a failing alternator often sits behind the scenes, quietly draining the life out of every new battery that goes under the hood.
The alternator keeps the electrical system alive. It charges the battery while the engine runs and powers everything from headlights to the infotainment screen. When that system falters, the battery pays the price. Replace the battery without addressing the alternator, and the same problem will return, sometimes within weeks.
