Fixing Both Headlights Out, But High Beams Shine Brightly

Both headlights not working but high beams are working is most likely caused by a burnt-out headlight bulb or a faulty electrical connection. This issue can be easily fixed by replacing the damaged bulb or repairing the wiring connection.

Understanding The Issue

Both headlights are out but the high beams still work. Find out the possible causes and solutions for this issue.

Common Causes Of Both Headlights Being Out:

  • Blown fuses: Check the fuse box and replace any blown fuses related to the headlights.
  • Faulty headlight bulbs: Inspect the bulbs and replace them if they appear burnt out.
  • Electrical wiring issues: Look for any loose connections or damaged wiring that may be affecting both headlights.
  • Malfunctioning headlight switch: Test the switch to ensure it is functioning properly and replace if necessary.
  • Corroded connectors: Clean or replace any corroded connectors that may be causing a poor electrical connection.

Reasons Why High Beams May Still Work:

  • Separate circuits: High beams and low beams often have different circuits, so a problem in one circuit may not affect the other.
  • Different filaments: The bulbs used for high beams and low beams have separate filaments, so if one filament is damaged, the other may still work.
  • Dimmer switch functionality: The dimmer switch allows you to switch between high and low beams, so a malfunctioning dimmer switch can result in both low beams being out while high beams still function.
  • Wiring connections: The wiring connections for high beams and low beams may be separate, meaning that a problem with one set of connections won’t necessarily affect the other.

Troubleshooting Steps

To troubleshoot both headlights being out while high beams work, follow these steps: check the headlight bulbs, inspect the wiring connections, test the headlight relay, and examine the headlight switch and fuse. Finally, if all else fails, consult a professional for further assistance.

Here are some steps to help you identify and potentially resolve the problem:

Checking The Fuse Box:

  • Start by locating the fuse box in your vehicle. It is typically located under the dashboard or in the engine compartment.
  • Carefully remove the cover of the fuse box and locate the fuse(s) that corresponds to your headlights.
  • Check the fuse(s) visually to see if they are blown or damaged. If you spot any issues, replace the fuse(s).
  • It’s always a good idea to keep spare fuses in your vehicle for emergencies.

Inspecting The Headlight Bulbs:

  • The next step is to inspect the headlight bulbs themselves. Begin by opening the hood of your car.
  • Locate the back of the headlight assembly and check for any loose connections or wires.
  • Carefully remove the bulb(s) and inspect them for any visible signs of damage or discoloration. If necessary, replace the bulb(s).
  • Ensure that the bulbs are properly seated and securely connected to the wiring harness.

Testing The Wiring And Connections:

  • If neither the fuse nor the bulb seems to be the issue, it’s time to check the wiring and connections.
  • Use a multimeter or voltmeter to test the electrical continuity in the wiring harness.
  • Focus on the areas where the wiring connects to the headlight assembly and look for any signs of loose or damaged wires.
  • Repair or replace any faulty wiring or connections that are identified during the test.

Remember, troubleshooting can be a process of elimination, and if you are uncertain about any of the steps or cannot determine the root cause of the problem, it is recommended to consult a professional mechanic.

Fixing The Headlight Issue

If both of your headlights are out but the high beams still work, there may be an issue with your low beam bulbs or fuses. To fix this problem, you will need to replace the faulty bulbs or check and replace the blown fuses.

Below, we will outline three possible solutions to the issue: replacing the fuse, changing the headlight bulbs, and repairing any damaged wiring.

Replacing The Fuse:

  • Check the owner’s manual or the fuse box diagram to locate the headlight fuse.
  • Use a fuse puller or a pair of needle-nose pliers to carefully remove the old fuse.
  • Inspect the old fuse to see if it’s blown or damaged.
  • If the fuse is indeed damaged, replace it with a new fuse of the same amperage rating.
  • Insert the new fuse into the appropriate slot and test the headlights to see if they’re working again.

Changing The Headlight Bulbs:

  • Consult your vehicle’s manual to determine the type and size of headlight bulbs you need.
  • Open the hood and locate the back of the headlight assembly.
  • Disconnect the wiring harness connector from the bulb socket.
  • Depending on your vehicle, you may need to remove a rubber cover or a retaining clip to access the bulb.
  • Carefully remove the old bulb by twisting it counterclockwise or pulling it straight out.
  • Insert the new bulb by twisting it clockwise or pushing it straight in until it locks in place.
  • Reconnect the wiring harness connector and test the headlights to ensure they’re functioning properly.

Repairing Any Damaged Wiring:

  • Inspect the wiring harness connected to the headlights for any visible damage, such as frayed or disconnected wires.
  • If you notice any damaged wiring, use electrical tape or wire connectors to securely reconnect and insulate the wires.
  • Test the headlights again to verify if the issue has been resolved.
  • If the problem persists, consider seeking professional assistance to diagnose and repair any underlying electrical issues.

Addressing The High Beam Brightness

Discover a solution for both headlights being out but high beams still working. Learn how to address the issue of high beam brightness effectively.

Here are some steps you can take to address this problem:

Checking The High Beam Relay:

  • Locate the high beam relay in your vehicle.
  • Remove the relay from its socket carefully.
  • Inspect the relay for any signs of damage or corrosion.
  • If the relay appears to be faulty, consider replacing it with a new one.
  • Reinstall the relay back into its socket securely.

Testing The Light Control Switch:

  • Locate the light control switch in your vehicle.
  • Turn on your high beams using the switch.
  • Check if the high beams come on at full brightness.
  • Wiggle the switch to see if the high beams flicker or dim.
  • If there are any issues with the switch, it may need to be repaired or replaced.

Inspecting The Wiring Harness:

  • Open the hood of your vehicle and locate the wiring harness for the headlights.
  • Ensure that all the connections in the wiring harness are secure and free from corrosion.
  • Look for any damaged or frayed wires that may be causing the headlights to malfunction.
  • If any issues are found, consider repairing or replacing the affected wiring.
  • Test the high beams again after inspecting and fixing any wiring problems.

Additional Considerations

If you find that both of your headlights are out but your high beams still work, there are some additional factors to consider. Dim headlights could be due to a blown fuse, a faulty headlight switch, or a problem with the wiring or connectors.

It is important to check these components to ensure proper functioning.

Whether you’re an avid car enthusiast or just a casual driver, encountering issues with your headlights can be a frustrating experience. One common problem is when both headlights are out, but the high beams still work. In this section, we’ll delve into some additional considerations to help you troubleshoot and resolve this issue effectively.

Adjusting The Headlight Aim:

  • Check if the headlights are properly aligned by parking your vehicle on a level surface, about 10 to 25 feet away from a wall.
  • Turn on both the low beam and high beam lights to assess the alignment.
  • Use the adjustment screws located near the headlights to adjust the aim.
  • Ensure that the headlights are pointing straight ahead, with a slight downward tilt to avoid blinding other drivers.

Cleaning The Headlights:

  • Dirty or foggy headlights can diminish their effectiveness, causing reduced visibility on the road.
  • Clean the headlights thoroughly using a dedicated headlight cleaning solution, or a mixture of mild soap and water.
  • Gently scrub the headlights using a soft microfiber cloth or a sponge.
  • Rinse off the cleaning product and wipe the headlights dry with a clean, lint-free cloth.
  • Apply a protective sealant or headlight restoration kit to keep the headlights clear and prevent future fogging or yellowing.

Using Professional Assistance If Needed:

  • If you’ve tried adjusting and cleaning the headlights without success, it may be necessary to seek professional assistance.
  • Consult with a trusted mechanic or an automotive technician who specializes in electrical systems and lighting.
  • They will have the expertise and proper tools to diagnose and fix more complex issues that may be causing both headlights to be out.
  • Be prepared to provide them with detailed information about your vehicle’s make, model, and any symptoms you have observed.

By following these additional considerations, you can enhance your chances of resolving the issue of both headlights being out while the high beams still work. Remember, proper alignment and cleanliness play key roles in the optimal functioning of your car’s headlights.

If all else fails, do not hesitate to seek professional help to ensure your safety on the road.


To sum it up, experiencing both headlights being out while the high beams still work can be a puzzling situation for vehicle owners. However, this issue could be traced back to a faulty relay, blown fuse, or a wiring problem.

It is crucial to address this problem promptly as it can affect visibility and compromise safety on the road. Consulting a professional automotive technician is recommended to accurately diagnose and fix the problem. Regular maintenance and inspections can help prevent such issues in the future.

Remember, addressing any automotive problem promptly ensures a smooth and safe driving experience. So, don’t delay in resolving a problem like this and prioritize your safety on the road.

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