How To
How to Inspect and Adjust Headlight Alignment: A Step-by-Step Guide
This guide is designed to help both individual car owners and fleet managers inspect and adjust the alignment of their headlights. Properly aligned headlights are crucial for safe nighttime driving and reducing glare for other drivers.

Misalignment can increase the risk of accidents and impact your safety on the road, but the good news is that inspecting and adjusting headlight alignment is a straightforward task that can easily fit into your maintenance routine.
Note
Always refer to the vehicle's owner's manual and local laws/regulations for specific headlight alignment instructions as they may vary.
What to Expect
- Time Needed: 20-30 minutes
- Difficulty: Moderate
- Average Cost: $53 (if paying for labor)
Source: 2025 Fleet Benchmark Report
What You’ll Need
Measuring tape
Masking tape or painter’s tape
Screwdriver or socket wrench (depending on the vehicle)
Level surface (like a garage door or flat wall)
Owner’s manual (for specific guidance)
How to Inspect and Adjust Headlight Alignment
Step 1: Park the Vehicle on a Level Surface
- Position your vehicle about 25 feet from a garage door or flat wall.
- Ensure the vehicle is level and tires are properly inflated.
- Keep at least half a tank of gas to simulate standard operating conditions.
Step 2: Mark the Headlight Beam Centers
- Turn on the low beams and face the wall.
- Use masking tape to mark the horizontal and vertical centers of each beam.
- Draw a straight horizontal line connecting both headlight centers at the same height.
Step 3: Check Alignment
- The brightest part of each headlight beam should sit slightly below the horizontal line and be centered on the vertical mark.
- If the beams are misaligned, adjustments are necessary.
Step 4: Adjust the Headlights
- Find the adjustment screws typically located at the back of the headlight housing.
- With a screwdriver or socket wrench, turn the vertical adjustment screw to raise or lower the beam.
- If available, use the horizontal adjustment screw to shift the beam left or right.
- Make small adjustments and reassess alignment against your tape markings.
Step 5: Test Your Alignment
- Take the vehicle on a night drive to confirm that the headlights illuminate evenly without causing glare.
- Make final tweaks as necessary.
Avoid These Common Mistakes
- Adjusting headlights on an un-level surface. If your vehicle isn’t parked on flat ground, your alignment will be off, even if you follow the steps perfectly.
- Raising the level of the headlights. Raising your headlights above the recommended level creates a blinding glare and unsafe driving experience for oncoming vehicles.
- Not testing the headlights after adjusting. Always take a nighttime test drive to make sure your adjustments provide even road illumination.
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Use Fleetio to keep all service histories organized, including headlight adjustments, preventive maintenance, and any unplanned breakdowns. Centralizing this information helps maximize vehicle safety and efficiency across your fleet.
Try Fleetio for FreeFAQs
What causes headlights to become misaligned?
Headlights can shift due to factors like road bumps, repairs, or simply replacing bulbs—a routine check can help catch these changes.
How do I know if my headlights need alignment?
If your headlights seem too dim or the road isn't lit up evenly, they may be misaligned. You might also notice oncoming drivers frequently flashing their lights at you. A quick wall test can confirm misalignment.
Why is proper headlight alignment important?
Keeping headlights aligned is a simple yet crucial part of vehicle maintenance. Proper headlight alignment improves nighttime visibility and ensures that your drivers feel safe on the road. Additionally, well-maintained headlights can reduce glare for oncoming traffic—promoting a safer driving environment for everyone.
How much do new windshield wiper blades cost?
Basic wiper blades cost $10 to $25 per blade, while premium options range from $25 to $50. Some auto shops offer free installation with purchase.
How often should I check my headlight alignment?
For regular vehicles, perform alignment checks once a year or after any major maintenance like bulb replacements or suspension work. If you operate a fleet or another high-use vehicle, it is recommended that you check the alignment more frequently due to the varied driving conditions fleets face.
How much does it cost to adjust headlights?
If you have the tools, DIY alignment is free! Otherwise, professional adjustments generally range from $25 to $75 at repair shops.
Can I adjust my headlights myself?
Absolutely! With basic tools and a flat surface, most vehicles allow for self-adjustment using the steps outlined above.