Q: My brake lights not working I changed the switch

asked by on

I changed the switch and it worked for a little while

It is possible both bulbs are burned out. The filament in each bulb should be tested with an ohmmeter. The bulbs can also be powered off the car to see if both filaments work but be wary of short circuits if you try something like that. Best to let a trained person deal with it. If the bulbs are good, check for corrosion and/or faulty connections in the bulb socket, wiring, and/or terminals. Finally, check for power at the bulb socket. If there is no battery voltage, obviously the circuit will have to be traced to find the fault which includes high resistances that could be causing a voltage drop. Also, check the ground. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a brake light bulb/circuit diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My brake lights not working I changed the switch

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: 20 amp ignition fuse continues to blow

Hello. All of this depends on what was spliced into that circuit when the engine was swapped out. I usually isolate this problem by disconnecting the circuits in it until it no longer blows. This fuse usually has a problem...

Q: Just replaced the serpentine belt and noticed a loud squeaking and smoking

It sounds like your car is overheating, and perhaps the water pump has seized up, which could account for the squealing, the smoking, and the overheating. It's entirely possible that the water pump seized due to the belts being overtightened....

Q: Acceleration and gas pedal problems.

This may be a sign of a failing throttle position sensor. The throttle position sensor (TPS) is a sensor used to monitor the throttle position of the throttle plate inside the throttle body in relation to your foot position on...

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...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...