Why wont my headlights turn on but my brights will?

By far the most common reason your brights will stop working is from a blown fuse or a bad relay. … Or, it could be a bad relay. If the headlight relay has failed, it may not respond when you attempt to switch the high beams on. Replacing the relay should restore the system and get your high beams working once again.

Why won’t my headlights turn on but my brights will?

All bulbs are plugged into a socket. Corrosion, a bad ground, or some other issues can damage the sockets and disrupt the power flow to the bulbs. If only the sockets of the low beams are bad, it will cause headlights not working but high beams are. It is unusual for both sockets to be damaged at the same time.

Why does my headlight work on high beam but not low beam?

Headlight Fuse or Relay

If a headlight fuse blows, it could cause the headlights to stop working. Most headlight systems are also designed with a relay that switches the power between low beam and high beam headlights. If this relay goes bad, it could allow power to the high beams, but not the low beams.

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Why does my headlight only work on high beam?

If just one bulb fails to work in either high beam mode or low beam mode, it may be the bulb. Most headlight failures that are limited to just high or low beams are related to a relay or the high beam control switch. … The cause: Foggy lenses, worn out bulbs, or a charging system issue.

What can cause your headlights to not work?

4 Reasons Your Headlights May Not Be Working

  1. Burned-Out Bulbs.
  2. Damaged Relay. …
  3. Wiring Problem. …
  4. Blown Fuse. One of the first things you should do in the event of an electrical problem like nonfunctional headlights is to check the appropriate fuse. …

What are the symptoms of a bad headlight relay?

Headlights Don’t Turn On

The most common sign of a bad headlight relay is headlights that don’t work. A headlight relay will typically fail in the open position, preventing voltage from reaching the headlights. If the low beam relay fails, the low beams won’t work.

Is there a fuse that controls the headlights?

Most headlight systems are going to involve a fuse, switch, relay, and bulb. … This relay is the connection between the battery of your car and your headlights. There are also fuses involved to protect the rest of your electrical system should there be a shortage.

How do you diagnose headlight problems?

Diagnosing the issue is a straightforward process.

  1. Turn on your headlights. Replace whichever headlight bulbs do not turn on. …
  2. Open the engine compartment fuse box. Pull the fuse that operates on the non-functioning headlight circuit. …
  3. Connect the negative lead of the voltmeter to the negative terminal on the car battery.
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Why is my high beam not working?

By far the most common reason your brights will stop working is from a blown fuse or a bad relay. … Or, it could be a bad relay. If the headlight relay has failed, it may not respond when you attempt to switch the high beams on. Replacing the relay should restore the system and get your high beams working once again.

Is there a fuse for high beams?

High beam fuse – A blown high beam fuse is easily fixed, but repeated blown fuses will require further investigation to find the cause of the excessive current. High Beam Relay – This is usually powered by the headlight switch and in turn powers the headlights.

Are headlights and brights the same bulb?

Vehicles that use single filament bulbs in the headlights have two separate bulbs. One bulb functions as the low beam or dipped beam headlight, and the other can be turned on to create the brighter high beams or main beams. Many vehicles use single filament bulbs.

Where is the headlamp fuse located?

The front of the dash panel has a fuse panel on it.

Why won’t my automatic headlights turn on?

Even if your car comes with automatic headlights, that mode may not be selected as deafault. If they still do not work despite being in the AUTO position, then perhaps the sensor has stoped working correctly. It’s easy to test- with the headlights in AUTO position, cover the sensor with your hand.

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