Chevy Tail Light Junction Block Problems

If you have a Chevy and your tail light junction block is not working, then it’s time to learn more about this common Chevy problem. 

The junction block on your tail lights connects different components in your car’s wiring system. These blocks are mounted near the base of a rear lamp assembly or under the fuel tank.

They are made from plastic and mounted with a threaded bolt and a large washer. These junction blocks are intended to prevent small electrical shorts from occurring in the wiring of your tail lights.

This post will teach you how to fix the Chevy tail light junction block problems and what can cause problems with this part of the car. We’ll also explain warning signs that mean the light juncture needs attention.

Chevy Tail Light Junction Block Problems

Chevy Tail Light Junction Block Problems

If you’re like Chevy owners, you probably have had your tail light junction block go bad or need to replace it on your vehicle.

For one reason or another, these blocks often fail over time. This happens because they get old or the mounting hardware wears out.

Eventually, they fail, and you need to change it out. Finding the replacement Chevy tail light junction block for your car is easy and available in many places, including online.

A chevy tail light junction block can be caused by various things, including rust, dirt, and corrosion. The junction block is the part of your car’s wiring harness that connects the electrical components in your car.

The chevy tail light Junction block is also called a wire harness connector or housing. Failing to replace the cable or its connection point in the event of damage could lead to intermittent problems with your lights and other electrical systems.

Chevy Tail Light Junction Block Diagram

A tail light junction block is usually seen at a corner where turn lanes or ramps come together. The lights used in these junctions typically cannot automatically time out and change from one set of lights to the next set, so they must be timed manually by someone.

Some models of junction blocks are designed for automatic timing that can be overridden at any time. These can be manual or automatic and are most often seen at freeway exits.

There are two blocks of lights generally used at a junction: a left turn signal, which is what drivers on the road waiting to make a left turn would see, and a right turn signal, which is what traffic merging into the flow of traffic sees.

Drivers on the road looking to make right turns often do not use these signals as they have their dedicated light.

Tail Light Combination Junction Block Diagram

Tail Light Combination Junction Block Diagram

The diagram below illustrates a typical segmented intersection layout with a tail light combination junction.

In the United States, these are used on roads with no stop signs or traffic lights. Understanding how this type of intersection works will help you avoid a collision if you know what to look for when approaching one.

In the diagram on the right, the green lines represent the road, and the gray lines represent the junction.

The small circles represent traffic that must stop at this intersection. The larger circle is for those who are turning left or right, and four diagonal arrows signify it.

Because this street has two lanes in each direction, there are two orange arrows to define how traffic can flow through it.

2006 Chevy Silverado Brake Light Fuse Location

The brake light fuse location of the 2006 chevy silverdo is in the Passenger compartment fuse box. The fuse used for the brake lights on a 2006 chevy silverado is used for after-market clearance lights. The fuse is in the bottom center of the console box, towards the rear of the vehicle.

On a newer Chevy Silverados, you will find one fuse located under your dash. If you want to check to see if your fuses are good, look at their side if they are blown out. This can also cause your battery light, ABS light, and Brakes to not work.

2015 Silverado Rear Body Junction Block

2015 Silverado Rear Body Junction Block

The rear body junction block is a part of the Chevy Silverado that performs the same function as its name suggests.

This part’s main role is to bridge the truck’s front and rear powertrain components. The body converts an electric current from a battery into mechanical energy, which in turn powers all of your vehicle’s moving parts.

It’s one of Chevrolet’s most important functions and can’t work without the rear body junction block. Think of it as just what connects your heart to your circulatory system.

The 2015 Chevy Silverado Rear Body Junction Block is on the rear axle’s left side. It’s part of a group of components known as powertrain control modules (PCM), and it’s essential for your truck’s overall performance.

The PCM houses an electric control box that regulates voltage and power to your vehicle’s moving parts, such as fuel injectors, the transmission, and more.

2007 Chevy Silverado Tail Light Problems

We have compiled a list of the most common and simple fixes for your tail light woes. Most of these problems can be fixed in less than 15 minutes and don’t require much more than a screwdriver.

Check Fuses

2007 Chevy Silverado Tail Light Problems

The first and best thing to start with is to check your fuses. The fuse box in your Chevy Silverado can be found beneath the steering column, on the left side of the dashboard. Use a Phillips head screwdriver to remove the cover.

Check Bulbs

The most common reason for tail light problems is simply burnt-out bulbs. Check your bulbs and ensure they’re in good condition if you don’t know how to follow the instructions for replacing your tail light bulb found here.

Check Harness Connectors

Check Harness Connectors

Another problem that may be causing your tail light failure is a loose or damaged wire harness connector. Remove the harness connector and secure it with electrical tape to resolve this.

Check Brake Light Switch

If you are still not getting any tail lights, then you may have a brake light switch malfunction. 

2006 Silverado Tail Light Junction Block

2006 Silverado Tail Light Junction Block

The 2006 Silverado Tail Light Junction Block is an electrical component found in rear tail lights. This junction block provides the tail light power and protects the wiring harness from damage.

If you need to replace this component, you should use a qualified mechanic for the job. If you want to do it yourself, follow this guide to replace the tail light junction block.

To remove the junction block, use a socket set – typically 6 or 12-point sockets – and a ratchet. Locate the wiring harness that connects to the junction block, then disconnect it with your hands.

Set aside all socket parts before continuing with removing this part. Remove the three bolts that hold down the tail light assembly, then pull out the junction block with your fingers and set it aside.

Before reinstalling the junction block, use a Phillips head screwdriver to loosen one of its bolts. Then, insert the bolt into the socket wrench and tighten it with the ratchet.

Now, reassemble all components – but only the three bolts that hold down the tail light assembly – then replace it on location.

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2000 Chevy Silverado 1500 Tail Light Combination Junction Block

A 2000 chevy silverado 1500 tail light combination junction block sounds like a mouthful, but it’s just an automotive component that can affect your vehicle’s performance. 

If you have a 2000 chevy silverado 1500 tail light combination junction block in your vehicle but are having problems with one of your lights, you should check the fuse first.

If it is blown, then the wire which feeds it is probably damaged. Also, check to ensure that your fuses are working properly. If they are all in good shape, then your vehicle’s wiring might be to blame.

2003 Silverado Tail Light Junction Block Wiring Diagram

2003 Silverado Tail Light Junction Block Wiring Diagram

This diagram is great because it shows you which wires are going where, and it also shows you the fuse location.

This wiring diagram will show you what goes where with your tail light junction block, and it has a built-in fuse to protect your wiring. The wire colors are black, white, red, blue/white, and yellow/green.

If you have a 2003 Chevrolet Silverdo, this diagram will help you find which color goes to each part of your vehicle’s wiring system so that everything is running smoothly.

How To Replace Tail Light Combination Junction Block

Here are the steps to Replace Tail Light Combination Junction Block-

  1. Remove the old light.
  2. Fill up the new one with silicone sealant to prevent flooding in the future.
  3. Stick it in the place of the old one; no need to use any adhesive or screwdriver.
  4. Put rubber caps on junction blocks; at this time, the new light will be working.
  5. It’s done.

What Would Cause Tail Lights Not to Work?

What Would Cause Tail Lights Not to Work?

The most obvious cause why your tail lights aren’t functioning is because you installed the wrong type of light bulb.

It might also result from a blown fuse, faulty wiring, or rusted sockets or plugs. A defective control light switch is another possibility.

A fuse typically blows when too much electricity is passing through it. It can be caused by an incorrectly installed bulb, loose or corroded connections, and a faulty light switch.

The wiring of your vehicle can suffer from corrosion and corrosion-induced damage. If a connection becomes loose or corroded and touches another wire, there is the possibility that it will cause an electrical short circuit.

This may cause the tail lights to appear as though they are not functioning properly. In some cases, this could result in a fire as well.

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How Much Does It Cost to Fix a Taillight?

The cost for fixing a tail light is $20-$100. The dealer will only attempt to fix your tail light at the cost of the part. If the problem is fixed, then you need not pay more.

If the tail light does not work after being repaired, then you will be charged for a new tail light. The best way to fix it is by using a kit that costs about $20-$40 and can be bought from any auto repair shop or online.

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Why Are My Tail Lights Not Going Off?

Why Are My Tail Lights Not Going Off?

The most common cause for the tail lights not going off is a blown switch or faulty brake light switch.

If you have a blown switch, check the fuse in your fuse box for the tail light. If you do not have a fuse box, borrow one from a friend who does. 

Your brakes may be faulty because of worn brake pads or an improperly adjusted brake line, and the brake light is not working because the brake lights relay switch is faulty, which would require your vehicle to be towed to get fixed.

With having no fuses or no friends with fuses, then most likely it is your brake lights relay switch that needs to be replaced.

How Do You Diagnose Tail Light Problems?

There are two main types of tail light problems. The first and most common is a loose bulb. This can be fixed by simply tightening the bulb to ensure it’s secure in its socket.

A loose bulb will show signs of intermittent flashing or completely not working due to the wires inside the lampost being able to transmit electricity effectively enough for this type of light to turn on or for you to see them flashing at night.

The second and less common type of tail light problem is that it may be out of alignment. This is usually caused by a bend in the cable or a loose connection between the socket and the bulb.

How Do You Find A Short in A Tail Light Wire?

How Do You Find A Short in A Tail Light Wire?

If you’re trying to figure out how do you find a short in a tail light wire, these are some easy ways to start:

  • listen for buzzing noise from the car’s interior, or
  • use your voltmeter and measure voltage between the positive and ground wires of the taillight circuit.
  • use your voltmeter and measure the voltage on each light bulb socket at the back of the car.

Is There A Fuse for Each Tail Light?

Yes, there is a fuse for each tail light. The fuse could be either inside the tail light or its corresponding fender.

You’ll need to find a diagram for your specific vehicle’s fuse box, which is located under the hood, to verify that you’re looking for the correct wires.

You can consult with a mechanic if you have any further questions about your vehicle or its parts. They should be able to give you an answer and help with future repairs.

What Should I Do If My Tail Lights Don’t Work?

Find your car’s fuse box and use a test light or a multimeter to check the fuse. See if your lights are on, but if they’re not, one of the fuses is blown.

If you’re still having problems, use a voltage tester to determine which fuse it is. When in doubt, replace the fuse box with a new one.

Attaching the lights is a matter of trial and error. If the wires aren’t properly attached, the light won’t be illuminated, and your battery will drain.

Follow your car manual to determine which wires are connected to which light and ensure they’ve attached accordingly.

Can You Replace A Tail Light Bulb Without Removing the Lens?

Yes, you can replace a tail light bulb without removing the lens. It’s not a perfect process, and there is no guarantee that it will still work, but it is really hard to get the tail light lens off.

One important thing that you should take care of before attempting the replacement is making sure your tail light will turn on when replacing or reattaching the bulb. 

If the light doesn’t turn on, then you should examine the light and see if there is anything wrong with it. If it doesn’t turn on, then there may be some problem with the wiring or fuse.

If all looks ok, you can check for broken wires or a fuse. If that doesn’t work, you would probably need to remove the tail light assembly from something like a jeep wrangler.

What Kind of Screwdriver Do I Need to Fix My Tail Light?

What Kind of Screwdriver Do I Need to Fix My Tail Light?

You need a Phillips-head screwdriver to fix your tail light. This type of screwdriver crosses a flat-head and a Phillips-head screwdriver.

It can go into both slots on the outside edge of the tail light. Once you have turned this screw clockwise, replace your headlight bulb to ensure the job is complete.

Also Read: Factory HID to LED Conversion


Tail lights are very important for cars, especially since it helps illuminate them at night. Most of the time, a tail light will turn on when you press a button in the car.

Sure, it’s nice to have them back and working perfectly, but if you take care of them by following the basic steps in this guide and not breaking anything, you could get your lights back quicker rather than having to wait weeks or months until you have time to look into getting them fixed properly.

I hope this article answers everything about chevy tail light junction block problems.

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