![]() ![]() Why do my headlights flicker when I drive? 8 How long can you drive with a bad alternator?.7 How can you tell if its the battery or alternator?.3 What are the signs your alternator is going out?.1 why do my headlights flicker when I drive?.A bad alternator can also cause your car to lose power while you are trying to accelerate or drive up steep hills. A sign that your car’s alternator might be going bad is flickering lights when you press on the gas or go up a hill. can a bad battery make lights flicker? The alternator or battery going bad is usually the cause of a car that won’t start. When the alternator gets slower than it can maintain its voltage the lights will dim some. My first guess is that this is normal because as you brake the engine slows down which also slows down the alternator. In this manner, why do my headlights dim when I hit the brakes?When the alternator gets slower than it can maintain its voltage the lights will dim some. Why do my headlights dim when i hit the brakes? This concern is caused by inadequate alternator output (controlled by the PCM) when the battery is under heavy load. Some vehicles may exhibit the headlights flickering when the vehicle is decelerating (by applying the brakes) with the headlights on.
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