Q: Really weird brake light activity

asked by on

Ok so I was working on a freinds car and she informs me that her brake lights don't work. So I got to inspecting it looking for the issue. Well her brake lights and running lights are the exact same bulb but with 2 coils. Both coils were in tact, there are no blown fuses and I figure the wiring is fine cause the running light coils still work in both lights. Now I know about the hole brake switch issue but here is the kicker, there is a third brake light on her tail fin and that one works like it should. So any suggestions

It is possible both bulbs are burned out. The higher wattage brake light filament in each bulb should be tested with an ohmmeter to make sure the filament is intact. 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. 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 and check the circuit ground. If there is no battery voltage, obviously the circuit will have to be traced to find the fault. If there is voltage, 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?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Really weird brake light activity

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: Rain water trapped underneath car

Hi, first off is there any more information about the water you can give us? The car has drainage areas for water to flow through which can get clogged up with debris and leaves. Water will build up and can...

Q: Radio turns on off uncontrolled

Hey there. This sounds like the radio has an internal problem (perhaps heat related). When the radio malfunctions, do other electrical features which are on the same fuse as the radio work properly? If other features on this fuse work...

Q: I have a question for you I have a 2007 Honda Civic. One brake light is not working the bulb seems okay. What could be the problem?

If the brake light bulb is good, then check the wiring to the brake light that is out and look for any broken wires or loose grounds. A broken wire or loose wire will cause a circuit to fail as...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...