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Brake lights are on constant when the headlights are on. This has only happened since the brake light bulb was replaced

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Check you have fitted the correct bulb,it should be a double filament bulb for the brake lights.single for the normal rear lights.

Posted on Oct 30, 2010

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1 Answer

What would cause one brake light to stay on only when headlights are on


Should be on with headlights. They are called tail lights if only one on you have one bulb blown.

Apr 15, 2014 | 1993 Subaru Legacy

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What would make the brake lights stops working when the Headlights turn on


The brake light bulbs could be at fault....They are designed to work with the brake pedal and the night running lights....The bulbs work as a two way light....This means they have 2 small wires inside the bulb...Some bulbs only have one wire but they only serve one purpose...In cases like that the bulbs are at fault normally or you have a bad wiring issue ...,there is also a brake light switch connected to the brake pedal but if your brake lights work it should be ok..but don't rule it out...anything is possible with older vehicles...Only one wire inside the bulb can burn out and cause one light not to work but the other light will work because the bulb still has one of the wires connected inside...One 1157 bulb works 2 lights,,,the brake light and the running light....It is common for them to blow only half way leaving the other light working ....Look at the difference between a 1156 bulb and a 1157 bulb and you will see what I am trying to describe..An 1156 is for only a one way light because it only has one wire....look at the difference between the two.....If you have never replaced them change them anyway...Sometimes you can't tell when they are blown....Normally the bulbs cause the problem you are having....Thanks

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1 Answer

Weird tail light problem


HI Matt,
Your issue sounds like a fault, most likely in the rear lights. Current is feeding from the brake light circuit, into the running light circuit. The most common causes are a bulb filament broken and touching the running light circuit, and loss of ground.
observe the rear lights closely and you should get a clue as to which light is failing....but if not, just pick one....
I would run a temporary ground and test again, if no results, pull the brake light bulbs...
Transient current is often difficult to wrap your mind around, until you understand what can happen.
Doc

Mar 08, 2012 | 2006 Jeep Grand Cherokee

1 Answer

Headlights flash when brakes used. Overcome by turning headlights on but then stop light on spoiler sometimes comes on. Cruise control cuts out without touching brakes. recent history was blown brake...


make sure the previously replaced bulb was the correct one and is installed correctly. it is a short between the tail light circuit and brake light circuit, this could even be a faulty bulb or bulb holder, the cruise will cut out if the brake light comes on, even if you dont touch the brakes

Apr 26, 2011 | 1998 Nissan Maxima

2 Answers

When headlight are on and hit the beake pedal only the 3rd brake light comes on the rest are stuck . When i release brake pedal it seems like i am driving with my brake light on . but my headlight off...


It may sound silly, but check your brake light bulbs to see if they have been installed incorrectly. Brake light bulbs have two filaments, one for tail light, and a brighter one for brake lights. On some cars if the bulb is installed wrong, the brighter filament will stay on for tail lights. The only other thing I can think of is the wrong bulbs have been installed.

Dec 25, 2010 | Toyota Camry Cars & Trucks

2 Answers

Left brake light stays on constantly when headlights are on. When headlights are off, left brake light is dimmer than right brake light when brakes are applied. I did recently change the brake bulb. ...


There is a shortage some where at the brake bulb and low beam holder. Take off the bulbs and inspect carefully those losing wires attached to the ends can cause the problem. Good luck.

Jun 25, 2010 | Hyundai Elantra Cars & Trucks

1 Answer

Brake lights stay on only when lights are on


check common rail. maybe the problem concerns with a lack of ground (car chassis), and the return path is made through the other bulbs.
Use a 400-grade sand paper to clean the contacts and the metal part of the bulbs.

Mar 14, 2009 | 1996 Toyota Celica

1 Answer

Dash lights, tail lights, brake lights, not working 1965 mustang


Probably either a bad ground (broken wire, rust) or a bad headlight switch. The brake light circuit goes from the stop switch (Located up above the brake pedal) through the headlight switch, through the light bulbs to ground. The tail light circuit goes through the headlight switch, through the bulbs and to ground. The only things that are in common are the headlight switch (Is this the switch you replaced?) and ground.
Not much, but hope this helps.
Have a super day!
Ron

Jan 09, 2009 | 1965 Ford Mustang

1 Answer

Right tail light not working when pressing brake w/ lights on.


There should be at least 2 bulbs in the light assembly. One light is the light that is on when you turn on your headlights with out the brake pressed, the other light only lights up while you press on the brake. Make sure you are replacing the correct bulb. You may have been replacing the bulb that stays on. Your lights may be set up to turn off the light that stays on when the headlights are on while pressing the brakes.

Nov 13, 2008 | 1993 Toyota Camry V6

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