Why does my headlight only work sometimes?

Most headlight failures that are limited to just high or low beams are related to a relay or the high beam control switch. Headlights work but seem dim. The cause: Foggy lenses, worn out bulbs, or a charging system issue. The fix: Clean the lenses, replace the bulbs, or repair the charging system.

Why would my low beams not work?

The likely cause is a fuse, headlight relay, headlight switch, dimmer switch or a wiring fault. About the only cause that is an easy fix is a blown fuse. Consult your owner’s manual to locate the main fuse for the headlight circuit and replace that fuse with one having the same amp rating.

How do I make my low beams stay on with high beams?

The electrical concept of low beams and high beams When we let go of the high beam, the positive wire flows the electricity back to the low beam, and it turns on again. So, the only change you have to do is ground the negative wire of your low beam.

How much does it cost to replace a headlight relay?

$79.99 – $99.99. All relays, including your headlight closure relay, are used to keep high amperage and voltage systems away from the driver as a safety measure. Used in “flip-up” lights, which fold out of the body of the vehicle, headlight closure relays are essential for headlight operation.

Why are my low beam headlights not working?

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.

How to troubleshoot an Acura TL headlight problem?

If the headlights are still not working, there may be an issue with the fuse. Locate the primary under-hood fuse box on the driver’s side. Remove the cover and locate the fuse numbered “3-2.” If the metal piece inside the fuse is broken, it will need to be replaced. Use the fuse puller to remove the fuse. Replace it with an identical 40A fuse.

What to do if your low beams don’t work?

Either way, if your low beams aren’t working but your high beams are, the first things we check are the bulbs. If you’re thinking of replacing the headlight bulbs yourself, make sure you’re familiar with the correct installation procedure for the type of bulb you’re replacing.

How does a high beam light bulb work?

Get familiar with the fuses and relays that control your headlights. The headlight switch usually doesn’t control the headlight bulbs directly, but through one or more relays. The headlight switch powers a relay, which powers the headlight bulb. This protects the headlight switch from the high current used by the high beam headlights.