tail light wont work brake light will

My brake light went out on my ford explorer. I went to replace it and now only the brake light works and not the tail light. The bulb is a two in one. lights the brake light and tail light. tried replacing the other bulb on the right side it didnt change anything. checked fuse and it wasnt fried.

My car has 150000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
You need to look at the front parking lights to see if they work with the parking lights on. Check the #11 15 amp fuse in the engine compartment fuse box to see if the fuse is good. If it is blown, then try to replace the fuse and turn on the parking lights. If the fuse blows again, then remove both rear bulbs and put in another fuse and see if the fuse blows again. The short may be in one of the bulbs you put in or one of the sockets that are shorted. There is a parking light relay in the relay module under the dash if the power does not turn on. Have a mechanic diagnose your rear lights if you need further help with this.

How to Identify and Fix Common car Problems ?

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Generally, the brake light and tail light use the same dual filament bulb. So, if one of the filaments in the light bulb breaks, the tail light may stop working while the brake light still works. However, some manufacturers use a separate light bulb for the brake light and tail light.
Bad Socket. If you have a single brake light out and the bulb is good, then the next step is to check the light socket itself. Brake light problems can include a socket whose connections are dirty or corroded or one whose wiring has become worn to the point where it`s only making an intermittent connection.
When the lower lights do not come on and only the third-brake light works, the brake-light switch may be ruled out. Again try the emergency-flashers to check for wiring, socket and lamp problems. If the flashers work, check for blown fuses as a few vehicles use separate circuits for the lower and third brake lights.
If one or more of your brake lights aren`t working properly, it could mean one of three things: The brake light system fuse is blown, the brake light bulbs are burned out or the brake light wiring switch is broken. All these issues are easy to troubleshoot.
Check the fuse.

A blown fuse usually causes both lights to go out. On newer cars, the tail lamps can be fused separately and/or each bulb or shared circuit can be fused. A fuse can be blown due to other problems, so you`ll need to check more than just the fuse, but it`s the right place to start.

The automatic lights you are referring to are likely the Daytime Running Lamps (DRLs). These are an automatic safety feature that is more for other drivers around you than for your driving comforts. This system does not turn on the tail lights, and they are dimmer than your normal headlights.
All vehicles require three working stop lamps (brake lights). The required brake lights consist of the two standard brake lights on each side of the rear of the vehicle.
Check Your Fuses

The first thing to check is whether or not the brake light fuse has blown. This fuse is usually located in the fuse box under the hood, and it`s relatively easy to check. Just remove the fuse and hold it up to a light – if the wire inside is broken, then you`ll need to replace the fuse.

Yes. The filament of the brake lights and turn signals are shared. The flasher relay is connected to the big filament on the side you are indicating to turn, which is disconnected by the turn signal switch.
Brake Light Circuits

Some vehicles have a bulb dedicated to each tail light function. These are called three bulb tail light systems. Each side of the vehicle has a bulb dedicated to the turning light, the brake light, and the running lights.

Green is for the right turn signal. Yellow is for left turn signal. White is ground, and brown is for the trailer`s taillights. These four types of wires together constitute what is known as “four-way wiring.” Four-way wiring is quite common and is suitable for most light-duty trailers and boat trailers.
The automatic lights you are referring to are likely the Daytime Running Lamps (DRLs). These are an automatic safety feature that is more for other drivers around you than for your driving comforts. This system does not turn on the tail lights, and they are dimmer than your normal headlights.
Check Your Fuses

The first thing to check is whether or not the brake light fuse has blown. This fuse is usually located in the fuse box under the hood, and it`s relatively easy to check. Just remove the fuse and hold it up to a light – if the wire inside is broken, then you`ll need to replace the fuse.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

All dashboard lights and tail lights do not work after driving through a lot of snow. Headlights work. And brake lights work.
ANSWER : Hello. We’ll be happy to help you. There are a few things that I recommend checking to discover why your lighting system is malfunctioning. The headlight dimmer switch should be checked. Along with the wiring harness above the right front tire behind the fender well cover. Also
the main fuse under the hood should be inspected because other people with your particular vehicle have had similar lighting issues if that fuse goes bad. It will be a great idea to check the rest of the fuses in that area too while checking the main fuse. Once the fuses are checked inside of the main fuse box then I would check the fuses inside of their interior fuse box. The interior fuse box should be located on the driver side of the dashboard near where your legs would be. If you need more assistance with repairing your vehicle please keep in mind that our organization provides Mobile Mechanics who can help you diagnose and repair your vehicle, all at competitive rates.

EPC light on 2004 Jetta. Code said brake switch faulty, but brakes lights worked. Replaced brake switch, now no brake lights.
ANSWER : Hi there. The first thing that pops in my mind beyond of what you have listed is perhaps the electrical harness attached to the brake switch. Perhaps the harness itself is damaged or you have an exposed wire, loose ground wire somewhere. You might want to have a professional mobile mechanic come to your location and complete a brake lights not working inspection to help you diagnose this issue.

Okay so when I turn my lights on at night my brake lights do not work, when I don’t have my lights on they work fine.
ANSWER : Hi there. Based on your inquiry, it’s highly probable that you have a damaged light switch or some electrical fault inside the turn signal relay. However, it’s also possible that the brake switch above the brake pedal could also be the source of your problem. Due to the fact that multiple electrical components might be causing this issue, it’s a smart idea to first have a professional mobile mechanic complete a brake lights are not working inspection, so they can determine what’s causing all of these issues and recommend the right repairs.

No dash lights, back right tail light is out, no parking lights. Brake lights work though as does head lights.
ANSWER : Hi there. In many cases, when you have electrical problems like you’re describing, it’s caused by multiple electrical component failure. It’s likely that a few electrical relays are not working; especially if you have systems that utilize the same components (such as your brake light and tail lights). I would recommend having a professional mobile mechanic come to your location to complete an electrical problems inspection first, so they can pinpoint what is damaged and recommend the right repairs.

Brake lights are not working. replaced brake light swtch still no brake lights. the third brake light the connection was melted at
ANSWER : The first thing to do is to repair third brake light and replace the brake light fuse and then see if the third brake lights work and the lower lights start working? If only the 3rd brake light starts working then you may need a further checks on the turn signal flasher or switch could be bad.

tail light wont work brake light will
ANSWER : You need to look at the front parking lights to see if they work with the parking lights on. Check the #11 15 amp fuse in the engine compartment fuse box to see if the fuse is good. If it is blown, then try to replace the fuse and turn on the parking lights. If the fuse blows again, then remove both rear bulbs and put in another fuse and see if the fuse blows again. The short may be in one of the bulbs you put in or one of the sockets that are shorted. There is a parking light relay in the relay module under the dash if the power does not turn on. Have a mechanic diagnose your rear lights if you need further help with this.

When I put my foot on the brake my back left brake light goes off, when I take it off the brake the brake light comes on
ANSWER : I would suggest trying to disconnect and reconnect the wiring to the rear lights. I have seen these older Toyota vehicles rear lighting short out on the lights themselves due to the way the light circuit was made on the lamp housing. Look at the housing circuit on the light to see if one is touching another, and that could tell you why it is malfunctioning. There could also be a problem with the brake light switch. If you are not comfortable dealing with wires, I recommend getting in touch with a certified mechanic who can look at your brake light issue for you to see what’s going on.

Brake light does not work.
ANSWER : Use the power wire from the brake light switch to activate the rear brake lights. By having an alternate power supply, ;the brake lights have no control without a switch, so the module is on but not functioning for the brake lights on the rear of the car. If you need further assistance with your brake module, then seek out a professional, such as one from Your Mechanic, to help you.