Blog Car Care Advice How to Change Headlight Bulbs: 6 Easy Steps + 4 FAQs
Car Care Advice

How to Change Headlight Bulbs: 6 Easy Steps + 4 FAQs

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You’re driving, and it’s getting dark. So you decide to turn on your headlights. 

But oh no, it’s not working!
You need them replaced ASAP.

Want to know how to change headlight bulbs on your own? 

Well, you’ve come to the right post! We’ll explain how to change the headlight and answer some FAQs about the headlight — like why it fails and how often it should be replaced.

This Article Contains

Time to switch the lights on.

How to Change Headlight Bulbs (Step-by-Step)

Changing headlights can be easy or difficult, depending on how your headlight housing is set up. But with some patience, you should be able to get it done.

Before you change your headlights, you need to decide what headlight bulbs to get

TIP: Also, you should conduct a quick fuse test, to make sure the headlight is the real problem and not a faulty fuse. A blown fuse can sometimes cause faulty or dim headlights. So finding out whether it’s a fuse or light bulb issue earlier can help you save time and money.

If your fuse is A-OK, and you have your new bulbs set aside, here’s what you need to do:

  1. Turn your vehicle off.
  2. Locate the headlight housing and disconnect the wiring harness.
  3. Remove the housing and unscrew the old bulb.
  4. Insert the new bulb and reattach the headlight housing to the electrical connector.
  5. Repeat the procedure for the other headlight.
  6. Test your new headlights.

Here’s a more detailed guide:

Step 1: Park in a Well-lit Area and Turn off the Engine

Park your vehicle on a flat, well-lit surface, and engage the parking brakes. Turn off the engine and remove the keys from the ignition. 

Step 2: Open the Hood and Disconnect the Headlight Housing

Open your hood and disconnect the negative terminal on the battery— to avoid touching a live wire. Next, locate the headlight backing behind the housing. Unscrew the dust cover and disconnect the power connector before removing the headlight housing unit. 

(Some headlight housings may not require removal, and you’ll have to access them directly from behind — through the engine bay or from the wheels.)

Disconnect the power connector by releasing the metal clip or screws attaching the power wires to the bulb. Use a Phillips screwdriver to pry a hard-to-remove metal clip. Sometimes you might also have to remove other components, like the battery or air filter housing. In some cars, you’ll also find a screw cap covering the electrical connector. Just remove it before releasing the power connector from the bulb.

Once you’ve removed the entire headlight assembly, time to replace the bulb from the headlight holder.

Step 3: Unscrew the Old Headlight Bulb

Before unscrewing the bulbs, in older vehicles, you’ll need to identify which headlight bulb is the low beam and the high beam. 

A new vehicle uses one light bulb for both. The bulb in a new car has two individual filaments, one for the low beam and the high beam lights.

If your vehicle uses two bulbs, here’s how you can distinguish them:

After taking note of the bulb placement, you can remove them from the bulb holder. Grab the bulb and turn it counterclockwise. 

Notice how the locking tabs behind it turn as well? 

Pull out the old bulb once the tabs are aligned. Be careful when removing the old headlight bulb from the bulb holder, and don’t ruin the locking tabs. Because once they’re damaged, you’ll have to replace the entire headlight assembly.

But if your car uses a sealed beam headlight, you’ll have to remove the screws that connect the glass cover to the body. Use a Phillips screwdriver to slowly pry off the glass cover once all the screws are off. Only after that can you unscrew the HID headlight bulb.

Step 4: Screw in the New Headlight Bulb

Set aside the old bulb and prep the new bulb. 

Handle the new bulb with gloves or wrap it in tissue paper. This prevents you from accidentally contaminating the new headlight bulb with oils or water, as it could reduce the light bulb’s life span.

Line up the replacement bulb with the locking tabs on the headlight holder and turn it clockwise until it clicks. If needed, gently wipe the bulb clean.

Reattach the headlight assembly to the car’s body. Be sure to connect the other components you have removed.

Step 5: Repeat Steps 2 to 4 on the Other Headlight

When replacing a headlight bulb, you should change them out in pairs. Usually, when one bulb dies out, the other isn’t far behind.

Simply repeat steps 2 and 4 with the headlight on the other side.

Step 6: Do a Quick Test 

With your new headlight bulbs in, turn the car back on, and test them out. Cycle through the high and low beams to ensure they work properly. 

If it’s all good, your car is ready for the road!

However, if you notice something wrong with the new bulb— they appear dim, don’t come on, or the check engine light illuminates, it’s best you take your car to the mechanic. Frayed power wires or a faulty wiring harness could be the culprit. Your mechanic will have to check and figure it out.

Remember that you need to check on the type of headlight your car uses before changing them? 
Let’s look into that.

Types of Headlight Bulbs and Housings

You should determine the type of bulb and headlight housing unit your vehicle has to ensure you get the correct headlight replacement bulb for your car.

A. Types of Headlight Bulbs

There are a few different headlight replacement bulb options. 
Here are the three main types of headlight bulbs:

Different headlight assemblies need different equipment and extra steps when replacing them. If you need to change your entire headlight assembly, you might want to know the types of available headlight housings as well. 

B. Types of Headlight Housing

Let’s explore some of the most popular headlight housing options:

Now that you have the basics of changing headlights, time for some FAQs.

4 FAQs About Car Headlights

Here are the answers to some common questions about headlights:

1. What Are the Signs of Failing Headlights?

These signs point to headlight failure:

Faulty headlights reduce visibility and can endanger other road users. So, replace your headlights if they show any of these signs.

2. Why Do Headlights Fail?

Headlights can fail for several reasons, like:

3. How Often Should I Replace My Headlights?

On average, you should get a headlight bulb replacement every 2,000 to 3,000 hours of use—usually after 7-10 years.

4. How Do I Conduct a Fuse Test for My Headlight?

Here’s how a mechanic would conduct a fuse test:

Final Thoughts

Regularly replacing headlights is crucial for optimal visibility and ensuring your safety on the road. Learning to change them independently is a good skill, and you can save some cash.

However, if you’re unfamiliar with auto parts and need a headlight bulb replacement for your vehicle, call in the professionals— like RepairSmith!

RepairSmith is a mobile auto repair service that you can easily get in touch with by filling out an online form. Our technicians are equipped with all the tools needed to fix any automobile issues you have.

Contact us today to check your headlight problems so you can drive safely again.