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Chevrolet Silverado: Why are My Headlights Dim?

Don't let dim headlights affect your safety on the road. Read more to learn how to diagnose and repair weak or faulty headlights on your Chevrolet Silverado 1500.

By Charlie Gaston - June 5, 2015

This article applies to the Chevrolet Silverado 1500 (1999-present).

You've noticed that your headlights appear more dim than usual. You're not certain if the dimming effect is the result of one or more issues. Don't panic! We will walk you through the most likely culprits that could be causing your headlights to dim, as well as explain the step-by-step instructions you will need to follow to resolve the problem. In most cases, you can complete the needed repairs at home. However, in other instances, you will need to head down to your local Chevrolet dealership for more specialized assistance.

Materials Needed

  • Replacement bulbs (HID bulbs recommended)
  • Replacement fuse

Step 1 – Replace the bulbs

They might not provide sufficient illumination to be noticeable while driving.

Replacing your OEM bulbs with high-performance aftermarket bulbs is one of the easiest repairs you'll make from home.

  • Remove the wiring harness for your headlight by hand to access the bulb.
  • Replace the bulb for the driver's side and passenger's side of your truck.
  • Many Silverado 1500 owners swear by Silverstar zXe.
  • HID bulbs are manufactured for low beam and high beam headlights.
Figure 1. Multiple varieties are available online.

Pro Tip

If you do decide to head to your local Chevrolet dealer or mechanic for professional help in swapping out your bulbs, the trip could cost you between $75 and $150.

Step 2 – Check the headlight fuse

It might need to be replaced.

Vehicle fuses blow out from time to time, although certainly not regularly. Check your headlight fuse and replace, as needed.

  • Open your fuse panel length-wise to access your headlight fuse.
  • Remove the fuse using a fuse grabber or a pair of tweezers.
  • Replace the fuse if the metal strip along the center of the fuse is broken or frayed.
Figure 2. Remove the fuse by pulling it out.

Step 3 – Pay attention to your cargo load

Many Silverado 1500 owners have noticed that their headlights will dim while they are hauling heavy cargo loads.

  • You might notice that your power windows operate more slowly than usual, as well.
  • Both occurrences are completely normal and, usually, are not a sign of a larger problem.
  • Your vehicle simply needs time to adjust to the extra load it is towing, as it continues to power your lights, windows and other systems.
Figure 3. Always be aware of your cargo load.

Step 4 – Have your dealer or mechanic check your electrical system

They might be failing.

There are any number of reasons why your headlights could be failing, including a larger electrical problem.

  • It's recommended that you have a certified mechanic inspect your truck's electrical system for damage. Your wiring harness might be faulty.
  • Your mechanic should check for short circuits and fuses as part of a multi-point inspection test.
  • If your truck has a bad wire, your repair costs could soar to as high as $600+.
  • Your mechanic will need to repair any exposed wire as well as clean and/or remove any signs of corrosion. (This is a big job that is best left to the professionals!)
  • Your local Chevrolet dealer will notify you in writing if your truck is currently involved in a recall.
  • General Motors issues Technical Service Bulletins (TSBs) for faulty components as they become known.
  • Ask your local Chevrolet dealer if any TSBs have been issued for your make and model.
Figure 4. Have your truck inspected.

Pro Tip

There is no cost to you for repairs that are needed as part of a recall.

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