Skip the auto shop - Our mechanics make house calls

Q: my high beams wont go on

asked by on

when I switch to high beam, the lights go off. low beams are okay. Is it possible for both lights to burn at the same time?

My truck has 350 miles.
My truck has an automatic transmission.

Hello. Thank you for writing in. The high beam light bulbs could absolutely fail at the same time. Its just highly unlikely unless there was a reason for them to blow. A reason such as a voltage spike. To start, you want to turn your attention to the components in which both head light circuits have in common. These are the fuse, and the switch. The fuses are the easiest to check and you should begin with that step. Secondly you may need to test the supply of power to the switch. The headlights and high beams should always have power available, as the switch controls the ground connection. If you are not familiar with this kind of testing, you may want professional help. Start with checking the fuses and make sure is not something that simple before complicating it.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car won't start. I looked under the car and the catalytic converter was smoking.

Hello. The first task is to determine what problem codes there are since the Check Engine Light is on. Quite possibly, something has caused a "way too rich" fuel mixture, making the engine choke down and clogging the catalytic converter....

Q: Fog lights not working says high beams are on. Multi function switch does nothing.

Hi there. The issue is with the multi-function light switch. I recommend replacing the multi-function light switch. What is happening is that the contacts on the switch are damaged and causing the lights to have no effect. If you need...

Q: Coolant leak causing overheating

If you can see the leak, that is where you need to start. A cooling system cannot operate efficiently with a leak or low level condition. If there are no leaks, the problem could be the thermostat, this is the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...