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Boxster 986 dim headlihgts5/28/2023 ![]() ![]() ![]() Loose Alternator Belt: Dimming lights may not be a sign of a bad alternator. Lenses yellow as they age, and this affects the amount of light that can escape and limits your visibility at night. Rather, they have to do with the aging of the headlight lens (the large plastic cover that protects the bulbs inside). Yellowed Lenses: Often, dim lights have nothing to do with the flow of electricity or aging bulbs. This will leave you stuck on the side of the road. The car will begin pulling power from the battery and because it’s not being recharged, it will eventually drain completely. If it fails, dim lights will be the least of your problems. If you notice that the lights brighten and dim as the engine revs up and down, the alternator should be checked immediately. Replacing the bulb is generally the only option here.īad Alternator: Another very common reason to see dim headlights is a failing alternator. This builds up on the inside of the bulb and dims the light output. Over time, the inert gas within the halogen bulb creates a discoloring film (brown or gray). If corrosion develops on the wire (or the connection is dirty or damaged), it disrupts the flow of electricity, often enough to limit the output of your bulbs.ĭiscoloring Deposits: This is particularly common with halogen type light bulbs. Ground wires connect the bulb circuit to your car’s chassis (which serves as the ground itself). Service type Headlights are dim InspectionĬorroded Ground Wire: One of the most common causes of dim headlights is a corroded ground wire.
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