Why are my high beams low beams?
If your high beams are on or activated when your first turn your headlights on (LOW BEAM ONLY) there may be a control wire switched on the harness. Note: This often refers to vehicles that have a single bulb for both high beam and low beam operation from the factory – such as H4, 9007 or H13.
How do high and low beam headlights work?
How High Beams Work and When to Use Them. The difference between the low beam headlights and the high beam headlights is the distribution of the light. When the low beams are on, the light is positioned forward and down so as to light the roadway but not affect the drivers who are driving in the opposite direction.
Why do high beam headlights work but low beams don’t?
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. 1. Headlight Bulbs This is the most common reason we see for why a car’s high beam headlights work but the low beams don’t.
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.
Why are the headlights on my car corroded?
As you may know, the headlights on most vehicles consist of headlight bulbs plugged into sockets. Over time, these sockets can become corroded. This might be due to a bad ground or a variety of other issues, but the result is a compromised connection with the headlight bulb.
What should I do if my headlight bulb fails?
If you have multiple headlight bulb failures, make sure you are especially clean when doing the job. If at all possible, don’t touch the glass portion of the bulb at all. If necessary, handle the bulb with clean latex or nitrile gloves. Finally, if the bulb is dirty, clean it with a fresh alcohol pad before installation.